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PTPR 6006_Corrosion Mechanisms
A cathode:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
Galvanic corrosion can occur in a pipe system where all the pipes are made of the same material because:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
Although the mechanism for sulphide cracking is not completely understood, it is agreed that one of the following conditions must be present before the problem can occur:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
A reaction in which there is an increase in valence of an atom resulting from a loss of electrons is defined as:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
The type of corrosion where an increase in the concentration of hydrogen at the surface of steel causing the hydrogen atoms to diffuse into the steel resulting in a severe loss of ductility is called:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
Galvanic corrosion occurs when a metal is electrically connected to another metal in the same electrolyte. The rate of galvanic corrosion depends upon the nature of the environment in which the metals exist as well as the:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
All of the following are important types of corrosion failure mechanisms associated with waterside boiler corrosion except:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
The type of bacteria that require oxygen to live and grow are referred to as:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
When biological corrosion occurs in an environment that is totally lacking in oxygen and high in sulphates, the most likely type of bacterial source of the corrosion is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
Dry atmospheric corrosion occurs when metals have the ability to form a stable film in the presence of:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B Question 1: For sulphide stress cracking to occur, hydrogen sulphide must be present, high-strength steel that is under tensile stress must be involved, and:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
Sulphate reducing bacteria (SRB) are very corrosive in an:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
Although the mechanism for sulphide cracking is not completely understood, it is agreed that one of the following conditions must be present before the problem can occur:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
When biological corrosion occurs in an environment that is totally lacking in oxygen and high in sulphates, the most likely type of bacterial source of the corrosion is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
Stray current corrosion differs from galvanic corrosion because stray current corrosion is caused by:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
A cathode:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
The type of bacteria that require oxygen to live and grow are referred to as:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
Although there are a number of environmental conditions that contribute to stress corrosion cracking, what must first exist for this condition to begin?
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
A reaction in which there is a decrease in valence of an atom resulting from the gain of electrons is defined as:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
The type of corrosion where an increase in the concentration of hydrogen at the surface of steel causing the hydrogen atoms to diffuse into the steel resulting in a severe loss of ductility is called:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B Question 1: Stray current corrosion differs from galvanic corrosion because stray current corrosion is caused by:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
Waterside corrosion in boilers can be a serious problem that can cause unscheduled shut downs of steam generators. In order to prevent this a boiler must be carefully monitored so that it maintains a magnetite coating that will help to prevent corrosions. What is the most important requirement to maintaining that coating?
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
When biological corrosion occurs in an environment that is totally lacking in oxygen and high in sulphates, the most likely type of bacterial source of the corrosion is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
In hydrogen stress cracking, the atoms of hydrogen interact with the metal to induce crack growth, which may lead to fracture. This cracking is in the absence of active corrosion. If there were active corrosion, the cracking would more correctly be termed:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
Galvanic corrosion occurs when a metal is electrically connected to another metal in the same electrolyte. The rate of galvanic corrosion depends upon the nature of the environment in which the metals exist as well as the:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
Galvanic corrosion can occur in a pipe system where all the pipes are made of the same material because:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
An anode:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
Sulphate reducing bacteria (SRB) are very corrosive in an:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
The most destructive source of stray current corrosion is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
A reaction in which there is an increase in valence of an atom resulting from a loss of electrons is defined as:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C Question 1: Waterside corrosion in boilers can be a serious problem that can cause unscheduled shut downs of steam generators. In order to prevent this a boiler must be carefully monitored so that it maintains a magnetite coating that will help to prevent corrosions. What is the most important requirement to maintaining that coating?
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
In hydrogen stress cracking, the atoms of hydrogen interact with the metal to induce crack growth, which may lead to fracture. This cracking is in the absence of active corrosion. If there were active corrosion, the cracking would more correctly be termed:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
The type of bacteria that require oxygen to live and grow are referred to as:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
An anode:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
Stray current corrosion differs from galvanic corrosion because stray current corrosion is caused by:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
For sulphide stress cracking to occur, hydrogen sulphide must be present, high-strength steel that is under tensile stress must be involved, and:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
A cathode:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
All of the following are important types of corrosion failure mechanisms associated with waterside boiler corrosion except:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
Dry atmospheric corrosion occurs when metals have the ability to form a stable film in the presence of:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
Galvanic corrosion can occur in a pipe system where all the pipes are made of the same material because:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B Question 1: In hydrogen stress cracking, the atoms of hydrogen interact with the metal to induce crack growth, which may lead to fracture. This cracking is in the absence of active corrosion. If there were active corrosion, the cracking would more correctly be termed:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
Galvanic corrosion can occur in a pipe system where all the pipes are made of the same material because:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
An anode:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
Sulphate reducing bacteria (SRB) are very corrosive in an:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
All of the following are important types of corrosion failure mechanisms associated with waterside boiler corrosion except:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
A cathode:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
Although the mechanism for sulphide cracking is not completely understood, it is agreed that one of the following conditions must be present before the problem can occur:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
For sulphide stress cracking to occur, hydrogen sulphide must be present, high-strength steel that is under tensile stress must be involved, and:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
When biological corrosion occurs in an environment that is totally lacking in oxygen and high in sulphates, the most likely type of bacterial source of the corrosion is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
The type of corrosion where an increase in the concentration of hydrogen at the surface of steel causing the hydrogen atoms to diffuse into the steel resulting in a severe loss of ductility is called:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B Question 1: Although there are a number of environmental conditions that contribute to stress corrosion cracking, what must first exist for this condition to begin?
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
Sulphate reducing bacteria (SRB) are very corrosive in an:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
A reaction in which there is an increase in valence of an atom resulting from a loss of electrons is defined as:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
For sulphide stress cracking to occur, hydrogen sulphide must be present, high-strength steel that is under tensile stress must be involved, and:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
The type of corrosion where an increase in the concentration of hydrogen at the surface of steel causing the hydrogen atoms to diffuse into the steel resulting in a severe loss of ductility is called:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
The most destructive source of stray current corrosion is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
In hydrogen stress cracking, the atoms of hydrogen interact with the metal to induce crack growth, which may lead to fracture. This cracking is in the absence of active corrosion. If there were active corrosion, the cracking would more correctly be termed:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
Galvanic corrosion occurs when a metal is electrically connected to another metal in the same electrolyte. The rate of galvanic corrosion depends upon the nature of the environment in which the metals exist as well as the:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
All of the following are important types of corrosion failure mechanisms associated with waterside boiler corrosion except:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
A reaction in which there is a decrease in valence of an atom resulting from the gain of electrons is defined as:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B Question 1: The type of corrosion where an increase in the concentration of hydrogen at the surface of steel causing the hydrogen atoms to diffuse into the steel resulting in a severe loss of ductility is called:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
Stress corrosion cracking is the cracking of a metal that requires the simultaneous action of:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
Although the mechanism for sulphide cracking is not completely understood, it is agreed that one of the following conditions must be present before the problem can occur:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
The factors affecting the rate of chloride stress corrosion cracking include:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
The type of bacteria that require oxygen to live and grow are referred to as:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
The most destructive source of stray current corrosion is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
Dry atmospheric corrosion occurs when metals have the ability to form a stable film in the presence of:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
In hydrogen stress cracking, the atoms of hydrogen interact with the metal to induce crack growth, which may lead to fracture. This cracking is in the absence of active corrosion. If there were active corrosion, the cracking would more correctly be termed:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
When biological corrosion occurs in an environment that is totally lacking in oxygen and high in sulphates, the most likely type of bacterial source of the corrosion is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
Although there are a number of environmental conditions that contribute to stress corrosion cracking, what must first exist for this condition to begin?
Correctness Rule: Single Correct Answer Required Answer(s) Given: B
Question 1: Gas systems have no electrolyte to carry current. The type of instrument used to measure corrosion from stack gases is called a:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
Because a resistance probe requires no ______________ to carry current, it can be used in ___________ systems to measure corrosion from stack gases.
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
Fluorescent dye penetrant will indicate cracks under:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
The depth of corrosion pits is measured with a:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
A steel coupon is installed in a corrosive system and left for 45 days. The coupon is rod shaped, 100 mm long and 5 mm in diameter. Over the 45-day period, it lost a total of 0.6754 g. The density of steel is 7.861 g/mL. The corrosion rate of the coupon is:
Corrosion rate (mm/year) =
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
Electrical resistance probes work on the principle that:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
When using radiography as an inspection tool, X-rays or gamma rays are used. The amount of radiation that passes through a metal in a given length of time is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
The instrument that is best suited for taking readings of the corrosion rate occurring on a coupon or electrode at the moment the measurement is taken is a:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
The term used to describe what is happening when thin layers slough off from the metal surface is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
Which of the following corrosion detecting methods uses a low viscosity, low surface tension liquid to detect cracks that extend to the surface of a metal?
Correctness Rule: Single Correct Answer Required Answer(s) Given: C Question 1: The linear polarization meters are available in either two or three-electrode models. In the three-electrode model, the third electrode is used as the reference electrode and is allowed to:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
Pieces of metal that are inserted into a system to evaluate corrosion within a system are called:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
A steel coupon is installed in a corrosive system and left for 45 days. The coupon is rod shaped, 100 mm long and 5 mm in diameter. Over the 45-day period, it lost a total of 0.6754 g. The density of steel is 7.861 g/mL. The corrosion rate of the coupon is:
Corrosion rate (mm/year) =
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
Coupons are pieces of metal that are inserted into a system to evaluate:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
Record keeping procedures and accurate and timely reporting and recording of corrosion, damage done, and measures taken are not as important as the taking of readings from corrosion monitoring equipment.
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
The depth of corrosion pits is measured with a:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
When using radiography as an inspection tool, X-rays or gamma rays are used. The amount of radiation that passes through a metal in a given length of time is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
Gas systems have no electrolyte to carry current. The type of instrument used to measure corrosion from stack gases is called a:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
The instrument that is best suited for taking readings of the corrosion rate occurring on a coupon or electrode at the moment the measurement is taken is a:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
The term used to describe what is happening when thin layers slough off from the metal surface is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A Question 1: Electrical resistance probes work on the principle that:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
When using radiography as an inspection tool, X-rays or gamma rays are used. The amount of radiation that passes through a metal in a given length of time is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
The term used to describe what is happening when thin layers slough off from the metal surface is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
Fluorescent dye penetrant will indicate cracks under:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
An electric resistance probe:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
The instrument that is best suited for taking readings of the corrosion rate occurring on a coupon or electrode at the moment the measurement is taken is a:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
When reporting corrosion, it is important to note the:
Correctness Rule: Single Correct Answer Required Answer(s) Given: D _______________________________________________
Gas systems have no electrolyte to carry current. The type of instrument used to measure corrosion from stack gases is called a:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
The coupon must be placed in a representative location, and oriented in such a way that it will:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
When using a slip-in rack to hold coupons, the coupon holding rod is contained in the retraction chamber, which is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A Question 1: The term used to describe corrosion when the attack is deep enough to catch a knife blade is:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
An electric resistance probe:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
Electrical resistance probes work on the principle that:
Correctness Rule: Single Correct Answer Required Answer(s) Given: C _______________________________________________
The coupon must be placed in a representative location, and oriented in such a way that it will:
Correctness Rule: Single Correct Answer Required Answer(s) Given: B _______________________________________________
A steel coupon is installed in a corrosive system and left for 45 days. The coupon is rod shaped, 100 mm long and 5 mm in diameter. Over the 45-day period, it lost a total of 0.6754 g. The density of steel is 7.861 g/mL. The corrosion rate of the coupon is:
Corrosion rate (mm/year) =
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
The instrument that is best suited for taking readings of the corrosion rate occurring on a coupon or electrode at the moment the measurement is taken is a:
Correctness Rule: Single Correct Answer Required Answer(s) Given: A _______________________________________________
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