When you invest in stainless steel components, you’re paying for corrosion resistance that can last decades. But here’s what many manufacturers don’t realize: thermal cutting methods like plasma or laser can alter the metallurgy at the cut edge, causing discoloration, hardening, or micro-cracks that can undermine stainless steel’s corrosion resistance. The solution? Understanding how waterjet cutting protects your investment and implementing the right post-processing practices to maintain that protection.<\/p>\n
Unlike thermal cutting methods, waterjet cutting keeps the material cold, preserving its corrosion resistance and mechanical properties. The process generates no heat, which means the stainless steel retains its mechanical properties and corrosion resistance. This is crucial because heat build-up at the surface can cause sensitization of the metal’s surface, which means significantly decreased corrosion performance and greater susceptibility to stress corrosion cracking.<\/p>\n
The absence of heat means the stainless steel retains its original hardness, temper, and corrosion resistance. There is no warping, hardening, or micro-fracturing along the cut edge. For manufacturers working with critical applications\u2014from food processing equipment to marine components\u2014this preservation of material properties is non-negotiable.<\/p>\n
Even with waterjet cutting’s advantages, proper post-processing remains essential for maximum corrosion resistance. Here’s what you need to know:<\/p>\n
Sometimes a light rinsing is recommended to remove any abrasive residue from the waterjet process. This simple step prevents abrasive particles from creating potential corrosion sites. The micro waterjet cutting process produces clean edges with very minimal burr formation, which typically means that waterjet-cut stainless steel requires little to no additional finishing or deburring.<\/p>\n
While waterjet cutting preserves the stainless steel’s natural corrosion resistance, certain applications may still require passivation. Passivation is a chemical process that enhances the corrosion resistance of stainless steel by restoring and strengthening its natural chromium oxide layer. This becomes particularly important when:<\/p>\n
Chemical passivation is a three-step process. The most commonly used chemical method is to apply nitric acid after all residues and free iron have been removed. The first step is to clean the surface of all organic greases and mineral or silicone oils. It is important to note that the stainless steel surface to be passivated needs to be thoroughly degreased.<\/p>\n
Post-processing protection extends beyond chemical treatments. Proper handling prevents contamination that could compromise corrosion resistance:<\/p>\n