Hello, your 316 material itself already has good salt spray. If you want to passivate it, it is recommended that you do not use a passivation solution made from anhydride or a passivation solution containing anhydride. It is not environmentally friendly, harmful and cannot pass monitoring, and the passivation effect is not the best. Our company specializes in making stainless steel passivation liquid and has obtained a national patent. Our passivation solution is chromium-free and environmentally friendly. The solution is stable, non-volatile and odorless. It complies with FDA and ROHS and can provide SGS reports. Just soak at room temperature. The standard sus316 after passivation is between 1000 and 1200H. You can try it for free. The space has contact information, if you are the one.