镍基合金K4169在人工海水中的腐蚀磨损交互作用

发布时间：2018-04-12 22:19

本文选题：镍基合金K4169 + 人工海水　；参考：《西北大学》2017年硕士论文

【摘要】：海洋环境中耐腐蚀镍基合金的腐蚀磨损失效是海洋开发等面临的亟待解决问题之一,腐蚀/磨损交互作用、环境致脆以及表面膜的形成与失效三个方面构成了当今该领域的主要研究内容。本论文在电化学-磨损联用的腐蚀磨损试验机上考察了 K4169在人工海水中的腐蚀磨损行为,重点考察了电化学参数(电位、溶液温度)和摩擦学参数(法向载荷)对材料总损失量、磨损量、腐蚀量以及交互作用量的影响规律,建立以法向载荷-电位为参数和溶液温度-电位为参数的腐蚀磨损图(总损失图、腐蚀磨损机理图、交互作用图),考察了在阴极保护下的环境致脆和表面膜的形成与失效。本论文得到以下的主要结果和结论:1.K4169合金在人工海水中有良好的抗腐蚀性能,这归因于其表面有稳定的耐蚀性钝化膜的生成。随着溶液温度的升高,K4169合金在人工海水中的抗腐蚀性能下降,且在高温易于发生缝隙腐蚀。K4169合金较K418合金和两种不锈钢(310S和304)有更好的抗腐蚀磨损性能。2.滑动摩擦状态下的动电位极化曲线表明:表面钝化膜的机械去除导致K4169合金腐蚀速率为其在静态动电位极化下的102～103倍。3.以法向载荷-电位为参数的材料损失图和磨损机理图表明:磨损量We占总损失量T值的87.1%～96.8%;由交互作用图可知,对抗作用,协同作用和加和作用均存在,以交互作用为主。4.以溶液温度-电位为参数的腐蚀磨损性能结果表明:溶液温度对合金腐蚀磨损性能的影响较复杂。5.在阴极保护下,电位(-1V和-0.6V)和溶液温度的变化引起一些物理化学变化,如合金表面电化学反应(析氢和吸氧)以及溶液化学(Mg(OH)2沉淀以及Na2S04的析出),从而对纯机械磨损量的测定产生影响。XPS和TOF-SIMS数据证实了表面膜的组成以及H+的分布。
[Abstract]:Corrosion and wear failure of corrosion-resistant nickel-based alloys in marine environment is one of the urgent problems to be solved in marine development.Environmental brittleness and the formation and failure of surface films constitute the main research contents in this field.In this paper, the corrosion and wear behavior of K4169 in artificial seawater was investigated on an electrochemical wear tester, with emphasis on the electrochemical parameters (potential, potential).The effects of solution temperature and tribological parameters (normal load) on the total loss, wear, corrosion and interaction of materials,In this paper, the following main results and conclusions are obtained: 1. K4169 alloy has good corrosion resistance in artificial seawater, which is due to the formation of stable passivation film on the surface of K4169 alloy.The corrosion resistance of K4169 alloy in artificial seawater decreases with the increase of solution temperature, and the corrosion resistance of K4169 alloy is better than that of K418 alloy and two stainless steels (310S and 304) at high temperature.The potentiodynamic polarization curves under sliding friction state show that the corrosion rate of K4169 alloy is 103 times higher than that of K4169 alloy under static dynamic potential polarization due to the mechanical removal of the surface passivation film.The results show that the effect of solution temperature on the corrosion and wear properties of the alloy is complex.Under cathodic protection, the changes of potential (-1V and -0.6V) and solution temperature lead to some physical and chemical changes.For example, the electrochemical reaction (hydrogen evolution and oxygen absorption) on the surface of the alloy, the precipitation of MgOH2 and the precipitation of Na2S04 on the surface of the alloy have an effect on the measurement of pure mechanical wear. The composition of the surface film and the distribution of H are confirmed by the data of TOF-SIMS and XPS.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG172.5

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