不锈钢产品在钝化处理前,都须酸洗,以清除焊缝氧化物,获得清洁的表面,酸洗液浓度虽很高(40%硝酸、20%氢氟酸、或含盐酸的混合酸),但焊缝氧化物并不能除净,还须辅以机械抛光,劳动强度较大。不锈钢制品经酸洗后,须用50%硝酸进行钝化处理。这样的酸洗、钝化工艺,挥发性有害气体的浓度高,影响操作工人的身体健康。 Stainless steel products must be pickled before passivating to remove the weld oxide and obtain a clean surface. The concentration of the pickling solution is high (40% nitric acid, 20% hydrofluoric acid, or a mixed acid containing hydrochloric acid) , But the weld oxide can not be removed in addition to net, but also must be supplemented by mechanical polishing, labor-intensive. Stainless steel products after pickling, to be passivated with 50% nitric acid. Such pickling, passivation process, the concentration of volatile noxious gases, affecting the health of workers.