共查询到18条相似文献,搜索用时 62 毫秒
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不锈钢上蓝色钼酸盐转化膜的研究 总被引:14,自引:2,他引:12
用阴极电沉积法从钼酸盐溶液中获得了蓝色的不锈钢转化膜,该膜具有良好的热稳定性。XPS和AES分析表明,膜厚约为427A。膜的表面以Mo(Ⅵ)与Mo(Ⅵ)共存。从AES深度剥蚀曲线的组成恒定区求得膜的组成为:54.3%O,28.4%,12.1%P,5.2%Fe。 相似文献
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铬酸盐转化膜中铬(Ⅵ)和铬(总)的玫瑰桃红褪色光度法测定 总被引:10,自引:3,他引:7
Zn,Cd镀层表面的铬酸盐转化膜中Cr(Ⅵ)和Cr(总)含量的准确测定对镀层的抗腐蚀性能影响较大,为此,用玫瑰桃红R褪色光度法对其测定进行了研究.在硫酸介质中,沸水浴加热条件下,Cr(Ⅵ)能氧化玫瑰桃红R,使其褪色,且褪色程度(ΔA)与Cr(Ⅵ)的量在一定范围内成正比关系.据此,建立了测定铬酸盐转化膜中Cr(Ⅵ)和Cr(总)的新方法.铬的浓度在0~8.0 μg/mL范围内,符合比尔定律.表观摩尔吸光系数为1.71×104 L/(mol*cm).本法灵敏度较高,重复性好,操作简便,用于镀锌、镀镉板表面铬酸盐转化膜中Cr(Ⅵ)和Cr(总)含量的测定,结果较理想. 相似文献
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载波不锈钢钝化膜稳定性的研究 总被引:2,自引:0,他引:2
在直流电位的基础上中一个方波电位对不锈钢电极进行钝化,通过改变方波脉冲宽度,幅值,阴阳极脉冲比等参数,用阳极极化曲线,电位衰减曲线,阴极还原曲线对钝化膜性质进行评价,选出最佳钝化条件。 相似文献
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不锈钢着色膜的耐磨性 总被引:2,自引:0,他引:2
用对比实验法研究了不锈钢酸性着色膜的耐磨性,提出了耐磨性较好的色膜的着色工艺参数及色膜硬化处理的方案。经本工艺及硬化处理后的着色膜耐磨性有明显的提高,并在生产中得到了应用。 相似文献
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Karl Davidson 《Materials and Manufacturing Processes》2016,31(12):1543-1555
Selective laser melting gained substantial momentum in the recent past and quite a few alloy systems have been researched and made available for commercial use; titanium, aluminum, stainless and tool steels, cobalt chrome, and Inconel being the most popular examples. Despite the application potential, and the successful processing of powder forms by traditional powder metallurgy methods, selective laser melting of duplex stainless steels was not attempted so far. The response of a duplex stainless steel alloy to processing by selective laser melting with varying process conditions is evaluated in the current research. Experimental results ascertained that the complete cycle starting from duplex powders, consolidating into 3D forms by selective laser melting and then post-process heat treatment to bring the microstructures back to duplex forms is feasible. Within the current experimental domain, the multi-layer samples are close to 90% density and showed a maximum dimensional variation of 2–3%, while the austenite to ferrite ratio is 45:55 after the post-process heat treatment. 相似文献
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Abhay K. Jha K. Sreekumar P. P. Sinha 《Journal of Failure Analysis and Prevention》2011,11(2):129-133
Adaptors used in check valve inlet pressure sensors were fabricated from austenitic stainless steel. Recently, during pretest operation and during hydrogen pressurization of an engine, a leak was noticed through the adaptor. Subsequent to disassembly, the leak was attributed to a crack in the adaptor. Detailed metallurgical investigations were carried out to understand the cause of cracking. Synergistic effect of chloride ions present in marine environment, the presence of residual stresses and sensitized grains of the material led to intergranular stress corrosion cracking. This article highlights details of investigation. 相似文献
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对空气自钝化、HNO_3化学钝化、高温氧化的不锈钢与低熔点金属Zn之间的交互作用进行了研究,揭示了不锈钢表面氧化膜层对两者交互行为的作用机理。通过扫描电子显微镜(SEM)观察了交互作用后生成化合物的界面和表面形貌,采用能谱分析仪(EDX)和X射线衍射仪(XRD)检测了化合物的元素组成和相成分。结果表明:Zn与不锈钢通过形成细小颗粒状δ-(Fe,Cr)Zn_(10)相和块状ζ-(Fe,Cr)Zn_(13)化合物的方式直接接触。空气自钝化和化学钝化处理使不锈钢表面生长钝化膜,降低了Fe-Zn化合物层的厚度,钝化膜阻碍了两者之间的交互作用。原子通过钝化膜的缺陷进行扩散反应,使Zn与不锈钢直接接触形成界面化合物,而钝化膜也在一定程度上抑制了Zn与不锈钢的交互作用。 相似文献
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