Why does stainless steel blacken

Hello! Because there are acidic corrosive components in acid washing liquid, sometimes different potions with a fixed model of stainless steel products will appear this situation

If there is, you can use a lighter concentration of acid pickling solution pickling.

Another if the material is not too assured, you can cut a little, or take the potion test can know whether the material is false.

The material of the tube is different, and different stainless steel materials should be matched with different formulas. The material of blackened tube is much worse than before.

When welding stainless steel with argon arc welding chicken, if the purity of the protection gas is not enough or the protection gas flow is too small, or the environment is windy, it will cause bad weld protection, and the weld will be oxidized black.

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