以磷酸二氢锰的盐溶液为研究体系,采用SEM和EDS和电化学分析手段,研究镁合金AZ31锰系磷化膜的生长过程和形成机理.结果表明:磷化膜的生长过程分为5个阶段:基体溶解-成核阶段(0~130 s)、基体和磷化膜溶解阶段(130~630 s)、磷化膜快速生长阶段(630~1300 s)、磷化膜稳态生长阶段(1300~2000 s)和磷化终止阶段(2000 s以后).磷酸盐晶核在镁合金AZ31浸入溶液的初始阶段一次形成,并优先在β相表面经过成核—长大—分裂—细化—增厚5个过程,沿表面方向生长和外延,最终形成致密的磷化膜.并且,磷化膜有两层,第一层是以Mg3(PO4)2和AlPO4以及MnHPO4为主的沉积薄膜;第二层则是在β相表面成核—长大的MnHPO4磷化膜.
参考文献
[1] | 王江峰 .镁合金表面磷化溶液及其磷化处理工艺:[P].中国,CN101096761A,2008-01-02. |
[2] | NIU Li-yuan,LIN Ji-xing,LI Yong,SHI Zi-mu,XU Lin-chao.Improvement of anticorrosion and adhesion to magnesium alloy by phosphate coating formed at room temperature[J].中国有色金属学报(英文版),2010(07):1356-1360. |
[3] | 曾荣昌,兰自栋,陈君,莫鲜花,韩恩厚.镁合金表面化学转化膜的研究进展[J].中国有色金属学报,2009(03):397-404. |
[4] | Qing Li;Shuqiang Xu;Junying Hu;Shiyan Zhang;Xiankang Zhong;Xiaokui Yang .The effects to the structure and electrochemical behavior of zinc phosphate conversion coatings with ethanolamine on magnesium alloy AZ91D[J].Electrochimica Acta,2010(3):887-894. |
[5] | 曾荣昌,兰自栋.镀液温度对AZ31镁合金表面锌钙系磷酸盐转化膜耐蚀性的影响[J].中国有色金属学报,2010(08):1461-1466. |
[6] | 刘锋,单大勇,曾荣昌,张津,韩恩厚.AZ31变形镁合金锰系转化膜溶液中锰消耗对膜性能的影响[J].腐蚀科学与防护技术,2010(05):377-379. |
[7] | 刘锋,单大勇,韩恩厚,刘常升.钙对镁合金表面锰系转化膜的影响[J].中国有色金属学报,2008(10):1825-1830. |
[8] | 周谟银.游离F-和氧化剂对铝镁合金(LF2)磷化过程的影响[J].材料保护,1998(07):13. |
[9] | 张文婷,方亮,郭培,赵兴强,金雷,李廷先.30CrMnMoTi高温锰系磷化膜形成过程研究[J].材料导报,2007(z2):455-456. |
[10] | 方峰,马驰,巩党国,曹文奎,蒋建清.低温磷化电位-时间曲线与成膜过程研究[J].材料保护,2007(10):1-4. |
[11] | 胡伟,徐淑强,李青.AZ91D镁合金锌系磷化膜成膜机理和生长过程的研究[J].功能材料,2010(02):260-263,267. |
[12] | 崔学军;王修春;卢俊峰 .一种镁合金无铬磷化溶液及其处理工艺[P].中国,CN201010123677.6,2010-10-06. |
[13] | Yingwei Song;Dayong Shan;Rongshi Chen;Fan Zhang;En-Hou Han .Formation Mechanism Of Phosphate Conversion Film On Mg-8.8li Alloy[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2009(1):62-69. |
[14] | Kouisni L;Azzi M;Zertoubi M;Dalard F;Maximovitch S .Phosphate coatings on magnesium alloy AM60 part 1: study of the formation and the growth of zinc phosphate films[J].Surface & Coatings Technology,2004(1):58-67. |
[15] | Wanqiu Zhou;Dayong Shan;En-Hou Han;Wei Ke .Structure and formation mechanism of phosphate conversion coating on die-cast AZ91D magnesium alloy[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2008(2):329-337. |
[16] | SONG Guang-ling;ATRENS A;WU Xian-liang;ZHANG Bo .Corrosion behaviour of AZ21,AZS01 and AZ91 in sodium chloride[J].Corrosion Science,1998,40:1769-1791. |
[17] | RICHARDSON M O W;SHAW R E .4.02-phosphate coatings[J].Shreir's Corrosion,2010,4:2494-2502. |
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