Crack Modification in Rare Earth Based Conversion Coatings

Document Type : Review paper

Authors

Surface coating and Corrosion Department, Institute for Color Research and Technology, P. O. Box: 16765-654, Tehran, Iran.

Abstract

Corrosion protection of metal substrates has been a researcher's concern for many years. Accordingly, various techniques are used to enhance the functionality of metals and improve their resistance. This research focused on conversion coatings due to their uniform film formation on metal surfaces, better interlayer adhesion, and easier application. These coatings act as a physical barrier between the substrate and the environment, and in addition to protecting against corrosion, by increasing surface energy, they improve the organic coating's adherence to the metal substrate. In recent years, many attempts have been made to upgrade the conversion coating's properties on metal surfaces by adding various additives. In this regard, additives in the form of rare earth elements (due to compatibility with the environment) were added to the conversion coating to increase its resistance to corrosion. However, the main issue with these coatings is producing small cracks in the final coating. Therefore, in this paper, the approach is to eliminate the cracks investigated.

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