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黑色磷化膜形成的因素分析 总被引:3,自引:0,他引:3
通过对黑色磷化膜形成的因素分析,采用控制磷化液的游离酸度,总酸度,磷化温度,以及工件的表面质量,解决了磷化液沉渣多,磷化膜结晶粗糙,外观颜色发灰等问题。 相似文献
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针对用热镀锌板代替电镀锌板制作零件时易出现漆膜脱落问题,对镀锌层组织结构、磷化液成分及磷化膜结晶形态进行了分析,得出热镀锌板静电喷涂漆膜脱落的主要原因是磷化膜结晶粗大,晶粒度均匀性较差。通过采取适当提高磷化液中Mn2 、Ni2 含量及添加适量F-等措施,明显改善了漆膜附着力。 相似文献
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常温快速磷化剂的研究 总被引:8,自引:2,他引:6
研制了一种锌系常温快速磷化液,考察了复合促进剂所含物质对磷化液磷化效果的影响,同时讨论了如何提高磷化成膜速度和磷化膜的耐蚀性等问题,并指出了工艺上的改进. 相似文献
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介绍了铝合金表面磷化膜形成的基本反应机理,详细分析了铝合金磷化反应前处理,磷化反应过程中三个区域的作用及磷化速度的影响因素,并对影响磷化膜质量的因素如磷化工艺参数、磷化液成分及磷化前后处理等进行了研究。 相似文献
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酸度及NaNO3对钢铁常温磷化的影响 总被引:4,自引:0,他引:4
应用电化学方法研究了酸度、添加剂硝酸钠对A3钢常 温磷化的影响.结果表明,在磷化液中加入适量的硝酸钠能明显优化常温磷化的动力学行为 .提出了钢铁三步常温磷化的机理. 相似文献
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介绍了冷挤压模具零件的快速磷化方法及其缺陷分析与改进措施。该方法可提高冷挤压模具寿命,提升产品的竞争力。 相似文献
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中温锌一钙系黑磷化膜的制备与性能研究 总被引:2,自引:0,他引:2
为了改善锌-钙系黑色磷化膜的外观和性能,探讨了配方与工艺,采用扫描电镜(SEM)观察磷化膜表面微观形貌,X射线荧光光谱法(XRF)分析磷化膜成分,测试了膜层厚度、附着强度、耐磨性和耐蚀性能.结果表明:采用硝酸铜作发黑剂,Na2MoO4为氧化促进剂,经过硝酸铋预浸处理能够获得深黑色、防护性能良好的磷化膜.CaO的含量增加能改变膜表面晶体形貌,当氧化钙含量为30g/L时,晶体粒径明显减小,膜层中锌、钙元素含量增加,使耐磨性能和耐蚀性能提高. 相似文献
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The phosphatizing quality is very sensitive to variations in the chemical composition of the surface. By annealing the steel sheets in a H2/N2-mixture with a dew point less than - 20 °C, an enrichment of strong oxide-forming elements (e.g. Mn, Si, V) occurs. The most important of these elements for the phosphatizing treatment is manganese. After annealing, the surface composition of the steel sheets was determined by ESCA analysis and the coverage of the enriched oxides was calculated. Zinc phosphatizing was performed in two different solutions, one with pH = 1.9 and the other with pH = 2.9. The nucleation rate was evaluated from SEM pictures. After phosphatizing, the samples were painted and exposed in laboratory test equipment to a SO2-polluted atmosphere (1 ppm) with a relative humidity of 90%. The weight increase gave a value of the corrosion rate. This investigation shows that both the nucleation rate of phosphate crystals and corrosion resistance are affected by the manganese enrichment, especially if the phosphatizing solution has a high pH (pH = 2.9). In this case, both the number of phosphate crystals and the corrosion protection are enhanced by the enrichment. At the lower pH value (pH = 1.9), no increased corrosion protection is obtained by the annealing treatment. The particle-size distribution of manganese oxide, which can be evaluated by consecutive ion etching and ESCA analysis of the surface, is also important to phosphatability. A large number of small particles uniformly distributed on the surface is the most favourable situation. 相似文献
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高速钢刀具磷化处理试验研究 总被引:1,自引:0,他引:1
为了探索磷化处理对高速钢刀具寿命的影响情况,采用不同工艺规范的磷酸锌盐快速热磷化和马日夫盐热磷化处理刀具,通过比较经磷化处理的刀具与未磷化处理的刀具的切削情况和耐蚀性能,得知磷化处理可以提高金属切削刀具的寿命和抗腐蚀性能.介绍了磷化膜质量检验的方法,重点分析了磷化处理工艺过程中,零件表面粗糙度、钢的合金元素、显微结构、磷化液温度、酸度、磷化时间等因素对磷化处理的影响.通过对磷化处理提高刀具寿命和抗蚀性能的机理分析,得到磷化处理提高刀具寿命和抗蚀性能的原因是:磷化膜导热性能差,不易使刀具切削刃升温,同时磷化膜改善了刀具表面的润滑条件. 相似文献