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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Electroplated Zinc-Nickel Alloy Coatings on the Fatigue Strength of AISI 4340 High-Strength Steel
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Effects of Electroplated Zinc-Nickel Alloy Coatings on the Fatigue Strength of AISI 4340 High-Strength Steel

机译：锌镍合金电镀层对AISI 4340高强度钢疲劳强度的影响

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Recovered substrates have been extensively used in the aerospace field. Cadmium electroplating has been widely applied to promote protective coatings in aeronautical components, resulting in excellent corrosion protection combined with a good performance in cyclic loading. Ecological considerations allied to the increasing demands for corrosion resistance have resulted in the search for possible alternatives. Zinc-eickel (Zn-Ni) alloys have received considerable interest recently, because these coatings show advantages such as a good resistance to white and red rust, high plating rates, and acceptance in the market. In this study, the effect of electroplated Zn-Ni coatings on AISI 4340 high-strength steel was analyzed for rotating bending fatigue strength, corrosion, and adhesion resistance. The compressive residual stress field was measured by x-ray diffraction prior to fatigue tests. Optical microscopy documented coating thickness, adhesion characteristics, and coverage extent for nearly all substrates. Fractured fatigue specimens were investigated using scanning electron microscopy (SEM). Three different Zn-Ni coating thicknesses were tested, and comparisons with the rotating bending fatigue data from electroplated Cd specimens were performed. Experimental results differentiated the effects of the various coatings on the AISI 4340 steel behavior when submitted to fatigue testing and the influence of coating thickness on the fatigue strength.
机译：回收的基材已广泛用于航空航天领域。镉电镀已被广泛应用于航空零件中的保护涂层，以提供出色的防腐蚀性能以及良好的循环载荷性能。与对耐腐蚀性的日益增长的需求相关的生态学考虑导致寻找可能的替代品。锌-镍（Zn-Ni）合金近来引起了人们的极大兴趣，因为这些涂层显示出诸如对白锈和红锈的良好抵抗性，高电镀速率以及市场接受度等优点。在这项研究中，分析了电镀锌-镍涂层对AISI 4340高强度钢的旋转弯曲疲劳强度，腐蚀和粘附强度的影响。在疲劳测试之前，通过X射线衍射测量残余压缩应力场。光学显微镜记录了几乎所有基材的涂层厚度，粘附特性和覆盖范围。使用扫描电子显微镜（SEM）研究了断裂的疲劳试样。测试了三种不同的Zn-Ni涂层厚度，并与电镀Cd样品的旋转弯曲疲劳数据进行了比较。实验结果区分了各种涂层在进行疲劳测试时对AISI 4340钢行为的影响以及涂层厚度对疲劳强度的影响。

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