经发蓝处理的零件可形成具有较强防护能力的化学转化膜,作为工序间的防锈和腐蚀轻微条件下零件的防护已被广泛的使用。然而很多工厂表面处理工人对皂化都不够重视,甚至在生产中有私自取消这道工序的现象,这是极端错误的。发蓝是钢铁件在140～142℃条件下,经氧化剂和氢氧化钠的共同作用生成四氧化三铁的过程。其反应如下 The blue-treated parts form a chemical conversion coating with a high degree of protection and are widely used as a protection for parts under mild conditions of rust and corrosion between processes. However, many factory surface treatment workers do not pay enough attention to saponification. Even the phenomenon of eliminating this process in production illegally is extremely wrong. Bluing is the process of ferroferric oxide formed by the co-action of oxidizer and sodium hydroxide under the condition of 140-142 ℃. The reaction is as follows