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首页> 外文期刊>Surface & Coatings Technology >Effect of high temperature oxide scale on steel surface for electroless nickel plating process and characterization of coatings
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Effect of high temperature oxide scale on steel surface for electroless nickel plating process and characterization of coatings

机译：化学镀镍工艺中高温氧化皮对钢表面的影响及涂层的表征

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摘要

An attempt has been made for an electroless nickel plating process on two steel substrates (with and without a high temperature oxide scale at the top surface) to identify the role of a high temperature iron oxide scale on coating kinetics. This study investigated if an iron oxide scale on the steel surface acts as a catalyst and promotes faster metal deposition. Coatings were characterized by scanning electron microscopy (SEM), glow discharge oxy emission spectroscopy (GDOES), and X-ray diffraction (XRD) and an iron oxide scale was characterized by Raman spectroscopy. Chemical composition and structure of both the coatings are the same but the coating obtained on a steel substrate having a high temperature oxide scale at the top is two times thicker. The electrochemical performances of both the coated steel substrates were evaluated by Tafel and electrochemical impedance (EIS) tests in an aggressive chloride environment. The coating obtained on a steel substrate containing a high temperature oxide scale at the top exhibits better resistance against chloride attack and charge transfer than the coating obtained on the steel substrate without a high temperature oxide scale at the top. This can be attributed to the highest thickness of this coating, which has the same chemical composition of the other coating, expected to give better resistance against chloride attack and charge transfer.
机译：已经尝试在两个钢基底上（在顶部表面上有和没有高温氧化皮）进行化学镀镍工艺，以确定高温氧化铁皮对涂层动力学的作用。这项研究调查了钢表面上的氧化铁鳞是否可作为催化剂并促进更快的金属沉积。通过扫描电子显微镜（SEM），辉光放电氧发射光谱（GDOES）和X射线衍射（XRD）对涂层进行表征，并通过拉曼光谱对氧化铁垢进行表征。两种涂层的化学组成和结构都相同，但是在顶部具有高温氧化皮的钢基材上获得的涂层厚两倍。通过Tafel和电化学阻抗（EIS）测试在腐蚀性氯化物环境中评估了两种涂层钢基材的电化学性能。与在顶部没有高温氧化皮的钢基材上获得的涂层相比，在顶部具有高温氧化皮的钢基材上获得的涂层表现出更好的抗氯化物侵蚀和电荷转移的抵抗力。这可以归因于该涂层的最高厚度，该涂层具有与另一涂层相同的化学组成，有望提供更好的抵抗氯离子侵蚀和电荷转移的能力。

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