灰铸铁表面Ni60A镍基合金感应熔覆层在H_2SO_4溶液中的腐蚀行为
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摘要
用多步感应熔覆法在HT300灰铸铁表面制备Ni60A镍基合金熔覆层,研究了熔覆层的显微组织、物相组成及其在H_2SO_4溶液中的腐蚀行为。结果表明:熔覆层与基体形成了良好的冶金结合;熔覆层主要由γ-Ni以及Ni_3Si、Cr_(1.12)Ni_(2.88)、Ni_3B、Cr_(15.58)Fe_(7.42)C_6等物相组成;熔覆层的电化学腐蚀存在钝化过程,自腐蚀电流密度和腐蚀速率远低于灰铸铁的,熔覆层/H_2SO_4溶液腐蚀体系的总阻抗值更高;在H_2SO_4溶液中熔覆层表面生成了具有钝化效果的Ni_2O_3,显著提高了其耐腐蚀性能。
Ni-based alloy cladding layer was prepared on the surface of HT300 gray cast iron by multi-step induction cladding method.The microstructure,phase composition and corrosion behavior in H_2SO_4 solution of the cladding layer were studied.The results show that the cladding layer was metallurgically integrated with the substrate.The cladding layer mainly consisted of γ-Ni,Ni_3Si,Cr_(1.12)Ni_(2.88),Ni_3B,Cr_(15.58)Fe_(7.42)C_6 and other phases.There was a passivated procedure in the electrochemical corrosion of the cladding layer.The free corrosion current density and corrosion rate of the cladding layer were far below those of gray cast iron.The cladding layer/H_2SO_4 solution corrosion system had a higher total resistance value.Ni_2O_3 with passivation effect was formed on the surface of cladding layer in H_2SO_4 solution,and improved the corrosion resistance of the cladding layer significantly.
Ni-based alloy cladding layer was prepared on the surface of HT300 gray cast iron by multi-step induction cladding method.The microstructure,phase composition and corrosion behavior in H_2SO_4 solution of the cladding layer were studied.The results show that the cladding layer was metallurgically integrated with the substrate.The cladding layer mainly consisted of γ-Ni,Ni_3Si,Cr_(1.12)Ni_(2.88),Ni_3B,Cr_(15.58)Fe_(7.42)C_6 and other phases.There was a passivated procedure in the electrochemical corrosion of the cladding layer.The free corrosion current density and corrosion rate of the cladding layer were far below those of gray cast iron.The cladding layer/H_2SO_4 solution corrosion system had a higher total resistance value.Ni_2O_3 with passivation effect was formed on the surface of cladding layer in H_2SO_4 solution,and improved the corrosion resistance of the cladding layer significantly.
引文
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[3]杨颖,水露雨,张瑜,等.镍基涂层的制备方法及应用[J].金属功能材料,2013,20(3):49-53.
[4]邓健星,吴亚飞,李汉润.船用柴油机气缸套低温硫酸腐蚀分析及策略[J].机电设备,2016,33(4):50-53.
[5]张增志,韩桂泉,付跃文,等.高频感应熔涂、激光熔覆与氧乙炔喷焊GNi-WC25涂层的性能研究[J].材料工程,2003,31(2):3-6.
[6]CHENG H,YI J,FANG Z G,et al.Tribology property of laser cladding crack free Ni/WC composite coating[J].Materials Transactions,2013,54(1):50-55.
[7]HOUDKOVá ?,SMAZALOVá E,VOSTRáK M,et al.Properties of NiCrBSi coating,as sprayed and remelted by different technologies[J].Surface and Coatings Technology,2014,253:14-26.
[8]胡舸,孟惠民,刘俊友.超音频感应熔覆镍基合金涂层组织及耐磨性能[J].材料热处理学报,2014,35(增刊2):193-197.
[9]刘永辉.电化学测试技术[M].北京:北京航空学院出版社,1987.
[10]蔡龙龙,牛显明,王晨曦,等.新型高铬镍基合金涂层组织与耐蚀性能研究[J].热加工工艺,2016,45(2):127-129.
[11]赵卫民,王勇.电化学阻抗谱法研究热处理对低碳钢镍基合金涂层腐蚀行为的影响[J].金属学报,2008,44(9):1125-1130.
[12]许乔瑜,周巍.Zn-Ni-V热浸镀层组织及腐蚀电化学行为研究[J].材料工程,2011,39(2):92-96.
[13]El-NEKHALY S H,MOHAMED A A A.The effect of hardening by heat treatment for gray cast iron on corrosion rate in H2SO4solutions model[J].Modelling,Measurement and Control,2004,64:1-8.