Cd.15 Corrosion Protection

1. What is the main single factor, which affects the cost of preparation and application to difficult vessel areas?

• The cost of access to an area

2. What determines the rate at which the corrosion process of steel proceeds?

• The conductivity of the electrolyte, ambient temperature, amount of oxygen present and the relative sizes of cathodic and anodic areas?

3. Oxygen is usually present where corrosion takes place. What would happen to steel in an area where no oxygen exists?

• A different form of corrosion could take place

4. Would cargo remnants, e.g. coal mixed with water affect the corrosion rate?

• The water in contact with the sulphur in the coal will form an active electrolyte, which will tend to accelerate the corrosion process.

5. What are the most important parameters to be observed during application of a convertible coating system?

• The over-coating interval being a product of time and steel temperature to be observed

6. What should be observed during application of convertible coating systems in cold weather?

• That sufficient curing time, above the minimum curing temperature of the coating, is allowed prior to application of the next coat.

7. What type of corrosion on a coated deck-area would you most worry about?

• 3% scattered corrosion

8. What are the most important things to monitor when inspecting coating conditions?

• Inspect both intact and corroded areas and also inspect angles, corners, behind bars etc

9. What is the key role that you carry out when evaluating steel condition?

• You need to be able to assess the condition and be able to report that condition accurately (so that decisions can be made based on your report.)

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