What Should To Do If the High Strength Bolt Excessive Corrosive?

High Strength Bolt often see some black streaks. It was also seen in testes that inorganic and organic cleaners were used to rinse the fasteners before heat treatment. After quenching, black streaks were still found and even carefully cleaned before heat treatment. An infrared spectrometer was used to analyze the surface residual contaminants and found to have higher concentrations of sulfur and calcium. Using a small amount of acetic acid in isopropanol, a piece of test filter paper was forcibly wiped at the dark spots on the filter paper. The analysis of the filter paper with an infrared spectrometer confirmed that calcium, sulfur, iron and other main elements. 

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