Will stainless steel rust when it encounters sweat?
A: 1, stainless steel is an iron alloy, more resistant to rust than ordinary iron, but still rust.
2, sweat is mainly water, a mixture of inorganic salts, sticking to the surface of stainless steel is more likely to form a primary cell and cause electrochemical corrosion, that is, rust, the essence of iron monomers are oxidized to iron oxide. Generally speaking, stainless steel and sweat is not reactive.
Stainless steel (Stainless Steel) is the abbreviation of stainless and acid-resistant steel, air, steam, water and other weak corrosive media or with stainless steel is called stainless steel; and will be resistant to chemical corrosive media (acids, alkalis, salts, and other chemical impregnation) corrosion of the steel is called acid-resistant steel. Because of the differences in the chemical composition of the two and their corrosion resistance is different, ordinary stainless steel is generally not resistant to chemical media corrosion, and acid-resistant steel are generally stainless.
As the surface of stainless steel has a chromium passivation film, generally not easy to be corrosion, but stainless steel is easy to be corroded by chloride ions, because chromium, nickel, chlorine is the same element, the same element will be interchangeable to form the corrosion of stainless steel. The degree of corrosion resistance is 316>304>201 material.
100 milliliters of sweat 98 ~ 99% of the composition of the main water, its specific gravity is about between 1.002 ~ 1.003, pH value of 4.2 ~ 7.5. NaCl is about 300 mg / 100 milliliters. 1 to 2% for a small amount of urea, lactic acid, fatty acids and so on. So if the stainless steel surface chromium passivation film is damaged, there is wear and tear if it is possible to be corroded by sweat.
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