What are the two broad classes into which corrosion in water systems can be divided?

• A. Localized and uniform
• B. Surface and deep
• C. Chemical and mechanical
• D. Active and passive

Answer: (A)

Corrosion in water systems can indeed be divided into two broad classes: localized and uniform. Localized corrosion occurs in specific areas of a surface and can lead to significant damage in a relatively small area, often resulting in pitting or crevice corrosion. This type of corrosion is particularly concerning because it may not be readily visible, making it difficult to detect until significant damage has occurred.

On the other hand, uniform corrosion affects the entire surface evenly and is typically easier to predict and manage. It tends to proceed at a relatively consistent rate, which makes it more straightforward to assess and mitigate through routine maintenance and monitoring practices.

Understanding these two types of corrosion allows water treatment professionals to better predict potential failures in water systems and implement appropriate preventive measures, ensuring the longevity and reliability of infrastructure.

The other options do not accurately encapsulate the primary ways corrosion manifests in water systems. For instance, surface and deep relate more to the physical characteristics rather than the corrosion behavior itself, while chemical and mechanical focus on the causes rather than the types of corrosion. Active and passive may refer to forms of corrosion concerning protective measures but do not classify corrosion in the broad sense applicable to water treatment systems.