纳米TiO_(2)颗粒对Ni-W-P合金镀层性能的影响  

Effect of Nano-TiO_(2) Particles on Properties of Ni-W-P Alloy Coating

作　　者：王小红[1] 刘豪[1] 蒋焰罡 李子硕 苏鹏 龙武 王水波[3] WANG Xiao-hong;LIU Hao;JIANG Yan-gang;LI Zi-shuo;SU Peng;LONG Wu;WANG Shui-bo(Southwest Petroleum University,Chengdu 610500,China;Petroleum Engineering Technology Research Institute of Northwest Oilfield Branch of Sinopec,Urumqi 830000,China;Chongqing University,Chongqing 400030,China)

机构地区：[1]西南石油大学,成都610500 [2]中国石油化工股份有限公司西北油田分公司石油工程技术研究院,乌鲁木齐830000 [3]重庆大学,重庆400030

出　　处：《表面技术》2022年第1期86-92,104,共8页Surface Technology

基　　金：四川省科技厅应用基础项目(2021YJ0346)。

摘　　要：目的探究纳米TiO_(2)颗粒对Ni-W-P镀层组织结构、耐蚀性与耐磨性能的影响,提高2024铝合金管材的耐蚀性。方法使用化学镀的方法在2024铝合金表面制备了Ni-W-P/TiO_(2)纳米复合镀层,通过SEM、EDS、XRD表征了镀层的表面形貌、表面元素分布以及镀层物相。对比了传统Ni-W-P镀层与所制备Ni-W-P/TiO_(2)纳米复合镀层的显微硬度与耐磨性。结果加入纳米TiO_(2)颗粒后,镀层表面变得更加致密,晶粒得到细化。EDS结果表明,纳米TiO_(2)颗粒在镀层中分布均匀。物相分析表明,镀层为晶态结构,加入纳米TiO_(2)颗粒后,镀层平均晶粒尺寸为9.706 nm,比Ni-W-P镀层的晶粒尺寸减小了0.612 nm。失重试验表明,Ni-W-P/TiO_(2)纳米复合镀层在Cl^(–)为2×10^(5) mg/L的地层水中具有较强的耐蚀性,腐蚀速率为0.1062 g/(m^(2)·h),与Ni-W-P镀层的腐蚀速率相比,减少了21%;与Ni镀层的腐蚀速率相比,减少了31%;与2024铝合金的腐蚀速率相比,下降了69%。电化学测试结果表明,Ni-W-P/TiO_(2)纳米复合镀层的自腐蚀电位较Ni-W-P镀层、Ni镀层以及2024铝合金分别正移了0.0813、0.1668、0.4141 V,腐蚀倾向更低。与Ni镀层、Ni-W-P镀层相比,Ni-W-P/TiO_(2)纳米复合镀层具有最高的显微硬度(535.6HV)以及耐磨性(0.1942 mg/min)。结论纳米TiO_(2)颗粒的加入可以减小镀层的晶粒尺寸,使镀层表面更加致密,同时提高镀层的硬度,增强镀层的耐蚀性与耐磨性。This paper is to explore the effect of Nano-TiO_(2) particles on the microstructure,corrosion resistance and wear resistance of Ni-W-P coating,and improve the corrosion resistance of 2024 aluminum alloy pipe.Ni-W-P/TiO_(2) nanocomposite coating was prepared on the surface of 2024 aluminum alloy by electroless plating.The surface morphology,surface element distribution and phase of the coating were characterized by SEM,EDS and XRD.The microhardness and wear resistance of the traditional Ni-W-P coating and the prepared Ni-W-P/TiO_(2) nanocomposite coating were compared.The results show that the grain of the coating is refined after adding nano-TiO_(2) particles.EDS results show that nano-TiO_(2) particles are evenly distributed in the coating.The phase analysis shows that the coating is nanocrystalline.The average grain size of the coating is 9.706 nm after adding nano-TiO_(2) particles,which is 0.612 nm smaller than that of Ni-W-P coating.The weight loss test shows that the Ni-W-P/TiO_(2) nanocomposite coating with the content of Cl^(–) is 2×10^(5)mg/L formation water has strong corrosion resistance,and the corrosion rate is 0.1062 g/(m^(2)·h),which is 21%lower than that of Ni-W-P coating,31%lower than that of Ni coating and 69%lower than that of aluminum alloy substrate.The electrochemical results show that the self corrosion potential of Ni-W-P/TiO_(2) nanocomposite coating is 0.0813 V,0.1668 V and 0.4141 V higher than that of Ni-W-P coating,Ni coating and 2024 aluminum alloy,respectively,and the corrosion tendency is lower.Compared with Ni-W-P coating,Ni coating,Ni-W-P/TiO_(2) nanocomposite coating has the highest microhardness(535.6HV)and wear resistance(0.1942 mg/min).The addition of nano-TiO_(2) particles can reduce the grain size of the coating,make the coating surface more compact,improve the hardness of the coating,and enhance the corrosion resistance and wear resistance of the coating.

关 键 词：2024铝合金 化学镀 Ni-W-P镀层 纳米TiO_(2) 复合镀层 微观组织 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]