Abstract
The fretting corrosion behaviors and the associated mechanisms of Zr alloy claddings with and without Cr coating in the primary water (310 °C/15.5 MPa) of the simulated pressurized water reactor were studied and compared. The results demonstrated that the fretting corrosion resistance of Zr alloy cladding was improved significantly by the introduction of Cr coating. The increased fretting corrosion resistance of the Cr-coated Zr alloy cladding was mainly attributed for two reasons. Firstly, the metallic Cr had much greater hardness than the Zr alloy and the formation of the ultra-fine grains layer under the worn scar further increased its hardness. Secondly, the metallic Cr had much better plasticity than the ZrO2 layer, resulting in better resistance to fatigue failure.
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