Which standard applies specifically to non-ferrous metals such as aluminum?

The correct answer is SSPC-SP 16, which specifically applies to non-ferrous metals, including aluminum. This standard outlines the guidelines for preparing non-ferrous metal surfaces through a variety of cleaning methods. The objective is to ensure that the surface is properly cleaned and primed to enhance the adhesion of coatings. It provides specific criteria for removal of contaminants, oxidation, and other surface imperfections, which are critical for achieving optimal coating performance on non-ferrous substrates.

Understanding the nature of non-ferrous metals is vital in coating applications, as they often require different surface preparation techniques than ferrous metals due to their unique properties. For instance, aluminum can oxide rapidly, making it crucial to follow SSPC-SP 16 to ensure that the surface is adequately prepared before applying any coatings.

Other standards mentioned focus on different types of surface preparation for either ferrous metals or general cleaning processes that do not specifically address the nuances of non-ferrous metals. This highlights the importance of selecting the right standard that aligns with the specific material being worked on to ensure the best possible results in terms of coating longevity and performance.