Which of the following is a convertible coating curing mechanism?

The correct answer is oxidation. In the context of convertible coatings, which are commonly used in protective coatings, the curing mechanism often involves a chemical change that transforms the liquid coating into a solid film. Oxidation plays a significant role in this process, particularly for certain types of coatings like alkyds or oils. During oxidation, the coating reacts with oxygen in the environment, leading to the formation of a hard, durable surface as it dries and cures.

Understanding the role of oxidation in curing helps inspectors evaluate whether a coating has properly adhered and formed the intended protective film as part of their inspection duties. Other curing mechanisms, such as chemical reaction and polymerization, also involve changes in the coating but are distinct in their processes. In particular, polymerization refers to the process of small molecules (monomers) chemically bonding to form larger structures (polymers), while evaporation primarily involves the loss of solvent, which may not necessarily involve a reactive process to form a solid film. This distinction is key in identifying the correct curing mechanisms used in different types of coatings.