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Corrosion of less corrosion-resistant metal is usually increased and the attack of the more corrosion-resistant is decreased in galvanic corrosion.
Consider the following statements regarding corrosion of ceramic material: 1. Ceramic materials are much better suited to withstand most of these environments for reasonable time periods than are metals. 2. Corrosion of ceramic materials generally involves simple chemical dissolution, in contrast to the electrochemical processes found in metals. 3. Ceramic materials are not frequently used because of their non-resistance to corrosion. Which of the above statements is/are correct?
Consider a reinforcing bar embedded in concrete. In a marine environment this bar undergoes uniform corrosion, which leads to the deposition of corrosion products on its surface and an increase in the apparent volume of the bar. This subjects the surrounding concrete to expansive pressure. As a result, corrosion induced cracks appear at the surface of concrete. Which of the following statements is TRUE?
Which of the following corrosion form is considered as the intermediate stage between uniform corrosion and complete corrosion resistance?
In a galvanic couple, the corrosion rate of the metal with active corrosion potential is accelerated whereas the corrosion rate of noble metal retards preferentially.
Which protection method is depicted in then given figure?
Electrometallurgy and Corrosion mcq question image
What is depicted in the given polarization curve?
Electrometallurgy and Corrosion mcq question image
Corrosion involves exchange of electrons in __________ corrosion.
Consider the following statements with respect to corrosion : 1. It is a natural process that converts a refined metal into a more chemically stable form such as oxide, hydroxide, or sulfide. 2. It is accelerated by warm temperatures and by acids and salts. 3. Galvanizing can protect against corrosion of iron and steel. Which of the statements given above are correct?
Excessive corrosion of metal takes place if corrosion product is ___________