An Overview on Process Optimization of Densification and Corrosion Resistance Enhancement of Conversion Coatings
LU Yong1,2, FENG Huixia1
1 School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 Research Institute of Lanzhou Petrochemical Corporation of Petrochina, Lanzhou 730060, China
Abstract: Chemical conversion coating technology is widely applied in the metal surface treatment which has a good protective effect for the metal anti-corrosion.However, during the coating formation process, the coating shrinks due to the severe hydrogen evolution reaction in the micro-cathode area and the loss of water during the drying process at the end of the coating formation, resulting in loose structure of the formed conversion coating and increased cracking of the coating layer.Crack damages the tightness of the coating,provides an efficient channel for corrosive medium and seriously weakens the protective effect of coating. This paper first introduces various environmentally friendly, chromium-free chemical conversion coatings and their preparation techniques, and analyzes the causes of micro-cracks in the conversion coating. In view of the defects of micro-cracks and poor corrosion resistance of various conversion coatings,researchers improved the continuity and corrosion resistance of the obtained conversion coating through various technologies.At present, the research on reducing the degree of cracking of the conversion coating mainly focuses on the following aspects,adding diffe-rent additives to the conversion solution, and adopting post-treatment means to seal the pores and the like. This paper focuses on the process optimization progress of the densification and corrosion resistance improvement of the conversion coating and focuses on the analysis of the process technology of adding different additives and post-treatment in the preparation process of the conversion coating. Additives that can be used for densification include metal ions, nano-particles, film-forming accelerators, and surfactants. In the preparation process of the conversion coating, different additives are added to the conversion solution, different additives have different densification mechanisms for the formed conversion coating and the degree of compactness also has a certain difference. Only different additives are added to the conversion solution and the process is relatively simple.However, when post-treatment of the prepared conversion coating is carried out,it is mainly using dihydric phosphate,sol-gel,film-forming materials different from the substrate coating and heat treatment technology.Various post-treatment technologies can also improve the protection efficiency of the coating.The advantages and disadvantages of the various processes mentioned above, the mechnism of densification and the anti-corrosion protection effect of the prepared coating on the substrate are summarized in detail. On the basis of literature summarization, the development direction of conversion coating technology on metal surface treatment is also prospected.
作者简介: 卢勇,2011年6月毕业于兰州理工大学,获得工学硕士学位。现为兰州理工大学石油化工学院博士研究生,在冯辉霞教授的指导下进行研究。目前主要从事功能材料在防腐蚀领域的应用研究。 冯辉霞,兰州理工大学石油化工学院教授,博士研究生导师。1987年兰州大学化学系无机化学专业本科毕业。2006年毕业于兰州理工大学材料加工工程专业,获工学博士学位。2005年至2006年在日本秋田县立大学做访问研修。先后两次入选甘肃省领军人才,现为中国化学会会员,甘肃省科技普及学会理事,兰州理工大学教学指导委员会委员,担任国家自然科学基金项目评议专家。主要从事功能复合材料研究及应用。近年来,在功能材料领域发表论文100多篇,包括RSC Advances、Advanced Materials、Journal of Power Sources、Journal of Magnetism and Magnetic Materials。共主编、副主编两部专著,主编教材四部。
引用本文:
卢勇, 冯辉霞. 转化膜致密化及耐蚀性能提升工艺优化进展[J]. 材料导报, 2020, 34(13): 13160-13166.
LU Yong, FENG Huixia. An Overview on Process Optimization of Densification and Corrosion Resistance Enhancement of Conversion Coatings. Materials Reports, 2020, 34(13): 13160-13166.
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2020, Vol. 34 
