电镀钨合金镀层组织及其耐腐蚀性能研究

摘要

By scanning electron microscopy(SEM). Energy-dispersive X-ray spectrometry(EDX), and X-ray diffraction(XKD), strength of the coating and substrate, coating surface morphology, corrosion product film and its components were mainly analyzed. The results indicate that the strength of coating and substrate is high, the cracks distribute on the coating surface evenly, the coating surface is covered by corrosion product film, corrosion only occurs in the cracks of coating surface, the cracks provide crevice corrosion with conditions and accelerate the pace of corrosion. It is proved that quenching process is the key factors of the coating quality and corrosion resistance.%主要分析了电镀钨合金镀层质量及其耐H2S-CO2腐蚀性能.通过SEM、EDX和XRD分析发现镀层与基体结合强度较高,但镀层淬火处理时出现龟裂现象,裂纹均匀排布于镀层表面.腐蚀评价表明腐蚀作用只发生在镀层淬火所形成的裂缝部位,造成裂缝内部充满大量腐蚀产物,非裂纹表面未见腐蚀.指出镀钨合金若用于酸性环境,尚需优化配方、降低硬度、增加韧性,此外还应检测基材屈服强度85％拉应力下的镀层应力腐蚀开裂行为.