R. Ghamsarizade¹, H. Eivaz Mohammadloo^2, and Sh. Roshan^1
1Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, Tehran, Iran
²Colour, Resin & Surface Coatings Department, Iran Polymer and Petrochemical Institute, Tehran, Iran

Part of the book: What to Know about Hydroxyapatite

Abstract

Hydroxyapatites (HA) are ceramic coatings of the calcium phosphate group that researchers in dental and bone implants have highly regarded due to their high resemblance to bone and tooth constituents. Much research has been done on HA coatings applied to magnesium, stainless steel, NiTi alloy, and titanium implants to increase their compatibility with the body’s physiological environment and accelerate bone tissue formation. Still, there are problems with the mechanical strength of this coating. And their adhesion has led to restrictions on their use. Moreover, the durability of these coatings in the physiological environment of the body is still discussed in many scientific articles. Therefore, many efforts have been made to increase corrosion resistance, adhesion, mechanical properties, and compatibility with the body environment. These efforts can be classified into three groups: the method of application of these coatings (electrodeposition, electrophoretic deposition. Sol-gel, dip coating, plasma spray, biomimetic coating, etc.), changes in the chemical structure of HA using the addition of different chemicals (cerium, magnesium, fluorine, carbon nanotubes, TiO2, etc.), and post-treatment using various biocompatible polymers (chitosan, polyamides, polyvinyl alcohol, gelatin, collagen, etc.). In this chapter, the effects of the modifications on the corrosion resistance properties of HA coatings are collected to make an efficient comparison by examining the mechanism of action.

Keywords: hydroxyapatites, implants, corrosion

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