转化膜致密化及耐蚀性能提升工艺优化进展

doi:10.11896/cldb.19030005

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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.

Key words： conversion coating densification corrosion resistance process optimization

Published: 24 June 2020

CLC number:

TG179

Fund:Ministry of Science “Scientists and Engineers Service Enterprise Program” (2009GJG10041), Fundamental Research Funds of Gansu Colleges (1105ZTC136)

About author:: Yong Lureceived his M.S.degree in Chemical Technology from Lanzhou University of Technology in 2016.He is currently pursuing his Ph.D. at the School of Petrochemical Engineering, Lanzhou University of Technology under the supervision of Prof. Huixia Feng. His research has focused on the application of functional materials in the field of anti-corrosion.
Huixia Fengreceived her B.E. degree in inorganic chemistry from Lanzhou University in 1987 and received her Ph.D. degree in Material Processing Engineering from the Lanzhou University of Technology.She worked as a visiting student at Akita Prefecture University in Japan from 2005 to 2006.Her research interests are research and application of functional composite materials.

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Cite this article:

LU Yong,FENG Huixia. An Overview on Process Optimization of Densification and Corrosion Resistance Enhancement of Conversion Coatings[J]. Materials Reports, 2020, 34(13): 13160-13166.

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http://www.mater-rep.com/EN/10.11896/cldb.19030005 OR http://www.mater-rep.com/EN/Y2020/V34/I13/13160

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