Passivation method of 317L stainless steel used in medicine

The electrochemical performance of 317L stainless steel used in medicine under different conditions of passivation (different contents of HNO3 solution, different passivation time and different passivation temperatures) was studied. The results show that the pitting potential of 317L stainless steel used in medicine can reach about 1.0 V (SCE) when electrochemically tested in 0.9% NaCl solution after the steel was passivated in 30% HNO3 solution at 35℃ for 6 h, which indicates that the passivation film has a relatively strong resistance to corrosion. The results also show that the corrosion resistance of the passivation film on the surface of 317SS can be increased after suitable amount of K2Cr2O7 is added into HNO3 passivation solution.