Content of hexavalent chromium is lower, pollution to theenvironment is reduced. 钝化液中铬酐含量较低，减少了对环境的污染。
Organic resin was used instead of chromic anhydride in the orthogonal experiment for research on non-chromate Dacromet technology. 摘要以有机树脂代替铬酐，在无铬达克罗工艺研究中进行正交试验。
