Etching and passivation are chemical surface treatments used to modify and enhance the surface properties of metals.While etching is primarily used to clean,texture,or prepare a metal surface for subsequent processing,passivation is designed to protect stainless steel and other corrosion-resistant alloys by enhancing their natural oxide layers. Both processes are essential in industries such as aerospace, medical devices, semiconductors, food processing, and general manufacturing, where surface integrity and cleanliness are critical.