船舶海水管系TC4钛合金的表面涂层与耐蚀性能
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摘要
采用磁控溅射和微弧氧化的方法在海水管系TC4钛合金表面制备了TiO_2、ZrO_2/TiO_2和Zn-ZrO_2/TiO_2涂层,观察了表面涂层的显微形貌和物相组成,对比分析了TC4合金基材和涂层的电化学腐蚀性能。结果表明,TiO_2、ZrO_2/TiO_2和Zn-ZrO_2/TiO_2涂层表面都可见火山喷涂状熔融堆积物,表面可见尺寸不等、形状不规则的显微孔洞,TiO_2涂层表面微孔平均直径约为4. 6μm,而ZrO_2/TiO_2和Zn-ZrO_2/TiO_2涂层表面的微孔平均直径都约为2. 2μm; TiO_2涂层中含有金红石型TiO_2相,而ZrO_2/TiO_2和Zn-ZrO_2/TiO_2涂层中还存在t-ZrO_2相和少量c-ZrO_2相;基材和微弧氧化涂层的腐蚀电位从高至低的顺序为ZrO_2/TiO_2> Zn-ZrO_2/TiO_2> TiO_2>TC4,ZrO_2/TiO_2涂层具有最佳的耐腐蚀性能,而掺杂Zn的Zn-ZrO_2/TiO_2涂层中的ZnO在电化学腐蚀过程中容易溶解而释放较多的Zn~(2+)而使得腐蚀倾向较ZrO_2/TiO_2涂层更大。
TiO_2,ZrO_2/TiO_2 and Zn-ZrO_2/TiO_2 coatings were prepared on the surface of TC4 titanium alloy by magnetron sputtering and micro arc oxidation,the microstructure and phase composition of the surface coatings were observed,and the electrochemical corrosion properties of the TC4 alloy substrate and coatings were compared and analyzed. The results show that the TiO_2,ZrO_2/TiO_2 and Zn-ZrO_2/TiO_2 coatings are visible like melt spraying volcano debris,micropores with different sizes and irregular shapes are visible on the surface,the pores on the surface of TiO_2 coating has an average diameter of about 4. 6 μm,while the micro pore average diameter on the surface of ZrO_2/TiO_2 and Zn-ZrO_2/TiO_2 coatings are about 2. 2 μm; the TiO_2 coating contains rutile type TiO_2 phase,while the t-ZrO_2 and the c-ZrO_2 phase exist in the ZrO_2/TiO_2 and Zn-ZrO_2/TiO_2coatings; corrosion potential of substrate and micro arc oxidation coating from high to low in the order of ZrO_2/TiO_2> Zn-ZrO_2/TiO_2> TiO_2> TC4,ZrO_2/TiO_2 coating has the best corrosion resistance,while the ZnO in the ZrO_2/TiO_2 coating doped with Zn is easy to dissolve during the electrochemical corrosion process and release more Zn~(2+),which makes the corrosion tendency larger than that of the ZrO_2/TiO_2 coating.
TiO_2,ZrO_2/TiO_2 and Zn-ZrO_2/TiO_2 coatings were prepared on the surface of TC4 titanium alloy by magnetron sputtering and micro arc oxidation,the microstructure and phase composition of the surface coatings were observed,and the electrochemical corrosion properties of the TC4 alloy substrate and coatings were compared and analyzed. The results show that the TiO_2,ZrO_2/TiO_2 and Zn-ZrO_2/TiO_2 coatings are visible like melt spraying volcano debris,micropores with different sizes and irregular shapes are visible on the surface,the pores on the surface of TiO_2 coating has an average diameter of about 4. 6 μm,while the micro pore average diameter on the surface of ZrO_2/TiO_2 and Zn-ZrO_2/TiO_2 coatings are about 2. 2 μm; the TiO_2 coating contains rutile type TiO_2 phase,while the t-ZrO_2 and the c-ZrO_2 phase exist in the ZrO_2/TiO_2 and Zn-ZrO_2/TiO_2coatings; corrosion potential of substrate and micro arc oxidation coating from high to low in the order of ZrO_2/TiO_2> Zn-ZrO_2/TiO_2> TiO_2> TC4,ZrO_2/TiO_2 coating has the best corrosion resistance,while the ZnO in the ZrO_2/TiO_2 coating doped with Zn is easy to dissolve during the electrochemical corrosion process and release more Zn~(2+),which makes the corrosion tendency larger than that of the ZrO_2/TiO_2 coating.
引文
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[4]肖峰,杜东方,陈辉,等.基于微弧氧化的钛合金复合涂层技术研究现状[J].热加工工艺,2018,47(10):7-9.Xiao Feng,Du Dongfang,Chen Hui,et al.Research status of titanium alloy composite coating technology based on micro-arc oxidation[J].Hot Working Technology,2018,47(10):7-9.
[5]赵成志,余姣姣,袁玉平,等.船舶海水管系钛合金组织及腐蚀性能研究[J].特种铸造及有色合金,2013,33(12):1161-1164.Zhao Chengzhi,Yu Huo,Yuan Yuping,et al.Microstructure and corrosion properties of titanium alloys for marine piping systems[J].Special-cast and Non-ferrous Alloys,2013,33(12):1161-1164.
[6]徐琳,丁建宁,许晓静,等.超细晶纯钛微弧氧化表面润湿性和耐腐蚀性能研究[J].稀有金属材料与工程,2015,44(12):3100-3104.Xu Lin,Ding Jianning,Xu Xiaojing,et al.Surface wettability and corrosion resistance of micro-arc oxidation of ultrafine pure titanium[J].Rare Metal Materials and Engineering,2015,44(12):3100-3104.
[7]Sami J,Caroline R,Delphine R,et al.Electrochemical studies on the stability and corrosion resistance of Ti-6Al-4V alloy for biomedical applications[J].Journal of Vacuum Science and Technology BMicroelectronics and Nanometer Structures,2011,29(6):06FF05-06FF05-4.
[8]Aziz-Kerrzo M,Conroy K G,Fenelon A M.Electrochemical studies on the stability and corrosion resistance of titanium-based implant materials[J].Biomaterials,2001,22(12):1531-1539.
[9]Contu F,Elsener B,B9hni H.Serum effect on the electrochemical behaviour of titanium,Ti6Al4V and Ti6Al7Nb alloys in sulphuric acid and sodium hydroxide[J].Corrosion Science,2004,46(9):2241-2254.
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[11]Karimi S,Nickchi T,Alfantazi A.Effects of bovine serum albumin on the corrosion behaviour of AISI 316L,Co-28Cr-6Mo,and Ti-6Al-4Valloys in phosphate buffered saline solutions[J].Corrosion Science,2011,53(10):3262-3272.
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