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《Surface Technology》 2017-10
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Preparation of Composite Coatings on 22MnCrNiMo Steel for Mooring Rope

SHEN Yan;LIU Gui-xiang;WANG Hong-xing;School of Shipping and Port Engineering,Jiangsu Maritime Institute;School of Materials Engineering,Nanjing Institute of Technology;  
The work aims to enhance corrosion resistance and life of mooring rope by preparing Ni-Si C composite coatings exhibiting excellent properties.The Ni-Si C composite coatings were prepared on the surface of 22 Mn Cr Ni Mo steel for mooring rope on ocean platform by adopting centrifugal force-based double-pulse electrodeposition technology.Microstructure and structure of the composite coatings were analyzed by using scanning electron microscope and optical microscope.Corrosion resistance of the coating was analyzed by performing static immersion corrosion test.The nano-Si C suspension containing 0.2 g/L SDS exhibited the best suspension property.Certain concentration of nano-Si C particles(2.0~4.0 g/L) was beneficial to obtain excellent surface morphology of Ni-Si C coating.Grain size on the composite coatings decreased gradually as the duty cycle increased.Optimal morphology of Ni-Si C coating could be obtained at the duty cycle of 50%.Provided with 2.0 g/L nano-Si C particles,corrosion mass loss of the coating was the minimum,2.867 mg/cm~2; provided with the duty cycle of 50%,corrosion mass loss of the coating was the smallest,3.059 mg/cm~2.Settling performance of nano-Si C particles in the bath containing dispersant is better than that without dispersant.The corrosion resistance of the coating obtained by adding nano-particles is better than that of the pure nickel coating.Additive amount and duty cycle of the nano-Si C particles have significant effects on microstructure and corrosion resistance of the composite coatings during the process.
【Fund】: 江苏省高校自然科学研究面上项目(16KJB580013);; 江苏省高校优秀中青年教师和校长境外研修项目;; 江苏高校“青蓝工程”和江苏海事职业学院千帆新锐项目(XR1503)~~
【CateGory Index】: TE985;TG174.4
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