环保型钢铁钝化耐蚀性及成膜机理  

Corrosion Resistance and Film Formation Mechanism of Environmental Protection Steel Passivation

作　　者：关皓 范云鹰[1] 聂风昊 席晓爽 吴俊明 刘彦章 GUAN Hao;FAN Yun-ying;NIE Feng-hao;XI Xiao-shuang;WU Jun-ming;LIU Yan-zhang(College of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650000,China;Kunming Zhongtianda FRP Development Co.,Ltd.,Kunming 650000,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650000 [2]昆明中天达玻璃钢开发有限公司,云南昆明650000

出　　处：《材料保护》2023年第2期64-69,共6页Materials Protection

摘　　要：钢铁腐蚀的现象越发普遍,工业上常用磷化作为防止钢铁腐蚀的方法,但磷化对环境污染严重。为了减少磷污染,以Q235钢为基体材料,研发了一种以植酸溶液为基础的环保型钢铁钝化工艺,利用硫酸铜点滴试验和电化学方法测试了环保型钢铁钝化膜的耐蚀性;利用扫描电镜(SEM)观测了钝化膜的成分和微观形貌。结果表明:环保型钢铁钝化后的样品硫酸铜点滴的平均时间达到了107 s,腐蚀电流只有4.3×10^(-3)mA,环保型工艺处理后的钝化膜的阻抗直径和阻抗模量大,其耐腐蚀性能较高。扫描电镜下的环保型钝化膜完整无裂纹,具有良好的耐蚀性能。最后简要分析了环保型钝化膜的成膜机理。The phenomenon of steel corrosion is becoming more and more common.Phosphating is commonly used in industry as a method to prevent steel corrosion,but it causes serious environmental pollution.In order to reduce phosphorus pollution,an environmentally friendly steel passivation process based on phytic acid solution was developed aiming at the base material of Q235 steel,and the corrosion resistance of the environment-friendly steel passivation film was tested by copper sulfate drop test and electrochemical method.Additionally,the composition and microscopic morphology of the passivation film were observed by scanning electron microscope(SEM).Results showed that the average time of copper sulfate drop after passivation reached 107 s,and the corrosion current was only 4.3×10^(-3)mA.Furthermore,the impedance diameter and modulus of the passivated film treated by such environmentally friendly process was large,and its corrosion resistance was higher.Meanwhile,the environment-friendly passivation film was found to be complete without any cracks when it was observed by scanning electron microscope,indicating a good corrosion resistance.Finally,the film-forming mechanism of the environment-friendly passivation film was briefly analyzed.

关 键 词：环保型钝化 钢铁 成膜物质 低磷 耐蚀性 成膜机理 

分 类 号：TG174.44[金属学及工艺—金属表面处理]