The Importance of Corrosion on the Erosion-Corrosion Performance of Thermal Spray Ceramic-Metallic Coatings

Abstract

This paper reviews some data regarding the combined effect of erosion and corrosion of thermal spray ceramicmetallic coatings and their potential application in sea water and production systems for the oil industry. The paper also presents recent research results from SINTEF Corrosion and Surface Technology with respect to development of new and better ceramic-metallic coatings from the Norwegian coating industry. It has been shown that taking new high velocity spraying technology into use in combination with recent developed powders, the result is a more corrosion and erosion resistant coating than the traditional and most often specified type Praxair LW45.

Corrosive Resistance of HVOF WC Coatings with a Different Binder

“…Experience shows that nearly all damages of WC-based materials occur at the binder first followed by the detachment of WC particles. Cho et al [20] and Rogne et al [21] obtained the same results in studying corrosive damage of WC coatings with Co, Ni, Co-Cr or CrC-Ni binder. They found that the corrosion occurs selectively on the metal binder first and then makes it dissolved.…”

Effect of Binder on Wear Behavior of HVOF WC-Based Coatings

“…For example, Wentzel et al [4] and Souza et al [5] indicated that a Ni binder provides better corrosive resistance than a Co binder for WC materials. Cho et al [6] and Rogne et al [7] studied corrosive behavior of WC with a different binder, i.e. Co, Ni, CoCr and presented corrosive mechanisms.…”