孙杰,张兴伟,明庭云,谭勇.钛合金表面稀土改性化学镀厚镀层及其性能[J].表面技术,2018,47(4):196-200.
SUN Jie,ZHANG Xing-wei,MING Ting-yun,TAN Yong.Preparation and Properties of Rare Earth Modified Electroless Plating Coating on Titanium Alloy Surface[J].Surface Technology,2018,47(4):196-200
钛合金表面稀土改性化学镀厚镀层及其性能
Preparation and Properties of Rare Earth Modified Electroless Plating Coating on Titanium Alloy Surface
投稿时间:2017-11-15  修订日期:2018-04-20
DOI:10.16490/j.cnki.issn.1001-3660.2018.04.029
中文关键词:  钛合金  化学镀  镍磷  稀土  热处理  共沉积
英文关键词:titanium alloy  elctroless plating  NiP  rare earth  heat treatment  co-deposition
基金项目:
作者单位
孙杰 沈阳理工大学 环境与化学工程学院,沈阳 110159 
张兴伟 沈阳理工大学 环境与化学工程学院,沈阳 110159 
明庭云 沈阳理工大学 环境与化学工程学院,沈阳 110159 
谭勇 沈阳理工大学 环境与化学工程学院,沈阳 110159 
AuthorInstitution
SUN Jie School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China 
ZHANG Xing-wei School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China 
MING Ting-yun School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China 
TAN Yong School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China 
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中文摘要:
      目的 在钛合金表面化学镀镍磷厚镀层,并研究稀土的引入对镀层性能的影响。方法 使用SEM及EDS对化学镀层的厚度及成分进行测试;使用XPS对镀层中的稀土元素价态进行分析;使用XRD对不同热处理方式的镀层进行组成分析;使用显微硬度仪测试经热处理的镀层的硬度;通过电化学测试对钛合金及经热处理的镀层进行耐蚀性分析。结果 经稀土改性的厚镀层由70 μm厚的Ni-P层和30 μm厚的Ni-P-Ce层组成。镀层由Ni、P及Ce三种元素组成,其各自的质量分数分别为89.94%、10.03%和0.03%,且铈由+4、+3和0三种价态构成。随着热处理温度的升高,镀层逐渐由非晶态转变为晶态,该转变发生于200~300 ℃,且成分也发生了变化;镀层的硬度增加,经400 ℃热处理的镀层硬度大约为1000HV。镀层的存在可以有效提升钛合金基材的耐蚀性,但是随着热处理温度的增加,耐蚀性大幅降低,最佳热处理温度为200 ℃(其腐蚀电流密度和极化电阻分别为0.2445 μA/cm2、155.464 kΩ)。结论 经稀土改性的镀层为100 μm厚的厚镀层。稀土元素铈与镍、磷在钛合金上发生了共沉积。热处理温度对镀层的结晶方式和成分都有影响,对镀层硬度具有明显的影响,对镀层的耐蚀性能影响较大。
英文摘要:
      The work aims to prepare electroless Ni-P coating on titanium alloy surface and study effect of rare earth on properties. SEM and EDS were used to test thickness and composition of chemical plating; XPS was adopted to analyze valence state of rare earth element in plating coating; XRD was taken to analyze composition of plating coating through different heat treatments; microhardness tester was used to test hardness of plating coating through heat treatment; and electrochemical test was conducted to characterize corrosion resistance of titanium alloy and plating coating through heat treatment. Rare earth-modified thick coating was composed of a 70 μm NiP layer and a 30 μm Ni-P-Ce layer. The coating was formed by three elements including Ni, P and Ce with respective mass fraction of 89.94%, 10.03% and 0.03%. The element Ce was composed of three valence states of +4, +3 and 0. With the increase of heat treatment temperature, the coating gradually changed from amorphous to crystalline. The transformation occurred at 200~300 ℃ and the composition also changed. The hardness of coating increased and reached 1000HV after heat treatment at 400 ℃. The coating could effectively improve the corrosion resistance of titanium alloy substrate, but the corrosion resistance dropped dramatically as the heat treatment temperature increased. The optimum heat treatment temperature was 200 ℃ (the corrosion current density and polarization resistance were 0.2445 μA/cm2 and 155.464 kΩ respectively). The coating modified by rare earth was 100 μm thick plating coating. Rare earth cerium, nickel andphosphorus are co-deposited on the titanium alloy due to reaction. The heat treatment temperature has obvious influence on crystallization mode, composition and hardness, especially corrosion resistance.
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