A Study on Cavitation Erosion and Corrosion Behavior of Al-, Zn-, Cu-, and Fe-Based Coatings Prepared by Arc Spraying

Abstract

Investigation to find a suitable coating material for a rudder application has been carried out in this study. Ten different coatings were prepared by arc spraying with Al-, Zn-, Cu-, and Fe-based wire feedstock. Both the cavitation erosion and marine corrosion behavior of the arc-sprayed coatings were evaluated, and compared with the conventional anti-corrosion paint. In terms of marine corrosion resistance, aluminum coating was the best among the tested coating systems while stainless steel coating showed the highest resistance against cavitation erosion. In addition, the effects of both the Si composition in Al-based coatings and the Ni composition in Cu-and Fe-based coatings were discussed in this study.

Effects of post annealing on the microstructure, mechanical properties and cavitation erosion behavior of arc-sprayed FeNiCrBSiNbW coatings

“…Firstly, this could be explained that the increase of annealing temperature promoted the formation of oxides on the coating surface and between intersplats, and it would weaken the cohesion of the coating and, in turn, reduce the cavitation erosion resistance. The negative effect of the oxides between intersplats on the cavitation erosion resistance has also been verified by Lee and Kim [36]. Secondly, a decrease of the fracture toughness (corresponding to an increase of annealing temperature) meant that the propagation of cracks in the sub-surface became easy, which inevitably led to more detachment of sprayed layer.…”

Cavitation Erosion Resistance Influence of Material Properties

“…high wear resistance, which can be beneficial in situations where surface wear or erosion can occur [51]. Kim and Lee [60] proved strongly dependence between hardness and CER of coatings produced by arc-spraying. However, as emphasized in Ref.…”

Influence of Different Heat Treatment Temperatures on the Microstructure, Corrosion, and Mechanical Properties Behavior of Fe-Based Amorphous/Nanocrystalline Coatings

“…Thirdly, coatings annealed at different temperature accelerated the existence of loose structure oxides on the coatings' surface and inside. Generally speaking, the oxides increased with increasing annealing temperature, the vast oxides can loosen the bonding force of the coatings [34], and the corrosion medium via oxide pore entering into coatings. Figure 6 shows the microstructure on the surface of all coatings immersed in a 3.5% NaCl solution for 540 min.…”