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首页> 外文期刊>Surface & Coatings Technology >Corrosion behavior of thermal sprayed WC cermet coatings having various metallic binders in strong acidic environment
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Corrosion behavior of thermal sprayed WC cermet coatings having various metallic binders in strong acidic environment

机译：具有各种金属粘合剂的热喷涂WC金属陶瓷涂层在强酸性环境中的腐蚀行为

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A series of the electrochemical and long-term immersion tests was carried out in a strong sulfuric acid (5 wt.% H2SO4) solution on thermal sprayed WC cermet coatings having various kinds of metallic binder in order to examine the effect of composition of binder materials on the corrosion behavior. In the present study, the coatings were processed via a high velocity oxygen fuel (HVOF) spraying technique with WC-Co, WC-Co-Cr, WC-CrC-Ni and WC-Ni composite powders. The experimental results revealed that a considerable galvanic corrosion occurred between WC particles and metallic binders in the aerated 5 wt.% H2SO4 Solution. The corrosion resistance of the coatings containing Cr was better than that of the coatings without Cr. For the coatings without Cr, general corrosion occurred in binder materials in addition to galvanic corrosion between WC particles and metallic binders. By contrast, the formation of passive film in the form of surface oxide in the coatings containing Cr suppressed the binder material dissolution into the solution. However, the overall corrosion resistance of the WC-CrC-Ni coating was inferior to that of the WC-Co-Cr coating due to the presence of microcracks which act as the infiltration paths of the solution. Conclusively, it is found that chemical composition of metallic binder materials and control of microcracks are the most important factors influencing the corrosion resistance of the HVOF sprayed WC cermet coatings in the strong acidic environment. Also, the wear-corrosion results such as surface morphologies and friction coefficients have been presented. (c) 2004 Elsevier B.V. All rights reserved.
机译：在具有各种金属粘合剂的热喷涂WC金属陶瓷涂层上，在强硫酸（5％重量的H2SO4）溶液中进行了一系列的电化学和长期浸没测试，以检查粘合剂材料组成的影响关于腐蚀行为。在本研究中，涂层是通过高速氧气燃料（HVOF）喷涂技术处理的，其中包括WC-Co，WC-Co-Cr，WC-CrC-Ni和WC-Ni复合粉末。实验结果表明，在充气的5 wt％H2SO4溶液中，WC颗粒与金属粘合剂之间发生了明显的电化腐蚀。含铬涂层的抗腐蚀性能优于不含铬的涂层。对于不含Cr的涂层，除了WC颗粒和金属粘合剂之间的电偶腐蚀之外，粘合剂材料中还会发生一般腐蚀。相反，在含Cr的涂层中形成表面氧化物形式的钝化膜抑制了粘合剂材料溶解到溶液中。然而，由于微裂纹的存在，WC-CrC-Ni涂层的整体耐蚀性不如WC-Co-Cr涂层，其整体浸蚀性是溶液的渗透途径。结论是，发现金属粘结剂材料的化学组成和微裂纹的控制是在强酸性环境中影响HVOF喷涂WC金属陶瓷涂层耐腐蚀性的最重要因素。而且，已经提出了诸如表面形态和摩擦系数的磨损腐蚀结果。 （c）2004 Elsevier B.V.保留所有权利。

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