CAJ | 학술논문

研究黏结相化学成分对涂层材料的耐盐雾腐蚀性能的影响，对采用超音速火焰喷涂制得的WC?17Co和WC?10Co?4Cr涂层进行电化学试验和长时间的盐雾腐蚀实验(浓度为5%的NaCl溶液，温度35°C)。结果表明：WC?10Co?4Cr涂层的耐盐雾腐蚀性能优于WC?17Co涂层。对于WC?17Co涂层，主要腐蚀行为除了粘结金属的腐蚀外还包括WC颗粒与粘结相金属之间发生的微点偶腐蚀；对于WC?10Co?4Cr涂层，形成的氧化物有利于抑制金属相与粘结相的腐蚀。说明金属材料成分是影响超音速火焰喷涂WC基涂层耐盐雾腐蚀性能的重要因素之一。
연구점결상화학성분대도층재료적내염무부식성능적영향，대채용초음속화염분도제득적WC?17Co화WC?10Co?4Cr도층진행전화학시험화장시간적염무부식실험(농도위5%적NaCl용액，온도35°C)。결과표명：WC?10Co?4Cr도층적내염무부식성능우우WC?17Co도층。대우WC?17Co도층，주요부식행위제료점결금속적부식외환포괄WC과립여점결상금속지간발생적미점우부식；대우WC?10Co?4Cr도층，형성적양화물유리우억제금속상여점결상적부식。설명금속재료성분시영향초음속화염분도WC기도층내염무부식성능적중요인소지일。
A series of electrochemical and long-term corrosion tests were carried out in a neutral saline (5%NaCl) vapor of 35 °C on thermal sprayed WC cermet coatings containing different kinds of metallic binders in order to examine the effect of composition of binder materials on the corrosion behavior. The experimental results revealed that the overall corrosion resistance of WC?Co coating was inferior to that of WC?Co?Cr coating. For the coatings without Cr, WC?Co, general corrosion occurred in binder materials in addition to galvanic corrosion between WC particles and metallic binders in the neutral environment. By contrast, the formation of passive film in the form of surface oxide in the coatings containing Cr, WC?Co?Cr, suppressed the binder and metallic binders to be eroded. It is found that the chemical composition of metallic binder materials is one of the important factors influencing the corrosion resistance of HVOF sprayed WC cermet coatings in the neutral vapor.