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Questions and Answers
Which practice involves adding substances in small amounts to significantly retard corrosion?
Which practice involves adding substances in small amounts to significantly retard corrosion?
- Alloying
- Inhibition (correct)
- Coating
- Anodizing
What is the unique advantage of adding an inhibitor for corrosion prevention?
What is the unique advantage of adding an inhibitor for corrosion prevention?
- It eliminates the need for coatings
- It requires no disruption of the process (correct)
- It changes the composition of the metal
- It enhances the strength of the metal
In which type of hydrocarbon system is a corrosion inhibitor soluble in hydrocarbon used?
In which type of hydrocarbon system is a corrosion inhibitor soluble in hydrocarbon used?
- Solid phase system
- Two phase system (correct)
- Liquid phase system
- Single phase system
What do inorganic inhibitors cause at anodic–cathodic areas?
What do inorganic inhibitors cause at anodic–cathodic areas?
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What may cause serious corrosion in feedwater lines, stage heaters, and boiler metal?
What may cause serious corrosion in feedwater lines, stage heaters, and boiler metal?
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Study Notes
Corrosion Inhibition Practices
- The practice of adding substances in small amounts to significantly retard corrosion is known as corrosion inhibition.
Advantages of Inhibitors
- The unique advantage of adding an inhibitor is the ability to effectively prevent corrosion with minimal additional cost and effort, enhancing the longevity of equipment and pipelines.
Hydrocarbon Systems
- Corrosion inhibitors that are soluble in hydrocarbons are notably used in oil and gas systems, where they help protect against corrosion in the presence of hydrocarbons.
Inorganic Inhibitors
- Inorganic inhibitors cause changes in anodic-cathodic areas, often promoting passivation, which reduces the rate of corrosion by altering the electrochemical reactions that occur on metal surfaces.
Causes of Serious Corrosion
- Serious corrosion in feedwater lines, stage heaters, and boiler metal may be caused by poor water quality, leading to factors such as oxygen ingress, pH imbalances, and presence of aggressive ions, which can promote corrosion processes.
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