Electrochemical Characteristics in Seawater for Cold Thermal Spray-Coated Al-Mg Alloy Layer

doi:10.1007/s40195-016-0437-7

Abstract

Abstract:

For corrosion protection of carbon steel in a marine environment, cold arc thermal spray coating was applied to the surface with Al and Al-Mg alloy wires. The surface hardness of Al and Al-Mg thermal spray coatings increased with Mg content. And the various electrochemical experiments were carried out to evaluate corrosion damage characteristics of the thermal spray coating layers. The Al and Al-Mg thermal spray coating layers presented negative potentials compared to carbon steel in corrosion potential measurements. And an anodic polarization experiment revealed a tendency of activation polarization with no passivation. Furthermore, the corrosion damage of the thermal spray coating layer in galvanostatic experiment was observed mainly at the defect area, and the Al-3Mg thermal spray coating layer presented less surface damages than others. In addition, the Al-3Mg thermal spray coating layer showed the lowest corrosion rate while having a sufficient driving voltage for cathodic corrosion protection. Therefore, it is an optimal thermal spray material for sacrificial anode.

Key words: Corrosion protection, Carbon steel, Arc thermal spray coating, Al-Mg alloy, Marine environment

Il-Cho Park,Seong-Jong Kim. Electrochemical Characteristics in Seawater for Cold Thermal Spray-Coated Al-Mg Alloy Layer[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(8): 727-734.

Figures/Tables 9

Fig. 1 Cross-sectional morphologies of the thermal sprayed coating layers: a Al, b Al-3Mg, c Al-5Mg

Fig. 2 Corrosion potential measurements of SS400 and thermal sprayed coating layers in seawater

Fig. 3 Anodic polarization curves of thermal sprayed coating layers in seawater

Fig. 4 Surface morphologies of thermal sprayed coating layers after anodic polarization experiment in seawater: a SEM analysis, b 3D analysis

Fig. 5 Cathodic polarization curves of thermal sprayed coating layers in seawater

Fig. 6 Results of Tafel analysis of thermal sprayed coating layers in seawater

Fig. 7 Surface morphologies of thermal sprayed coating layers with galvanostatic experiment in seawater

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