201 hot rolled stainless steel coilAcid passivation : acid passivation of stainless steel parts must be in strict accordance with passivation process requirements. 4.3.6 cleaning - drying : pickled after passivation, should be carried out strictly according to neutralizing, washing, drying, thoroughly eliminate residual acid. 4.3.7 protection : stainless steel surface treatment has been completed, should complete protection and avoid touching and secondary pollution of oil, dust and other debris. 4.3.8 to avoid reprocessing : stainless steel surface treatment has been completed, should be avoided on the parts or products of the reprocessing.