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通过比较三种前处理方法对所研制的固态防腐耐磨剂耐蚀性的影响,发现磷化前处理不仅能提高涂层与基体材料的结合力,而且也增强了涂层的耐蚀性,同时研究了磷化参数对涂层耐蚀性的影响。 相似文献
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为了提高铁、锌和铝等金属及其合金表面的耐蚀性,往往采用含有加速剂的磷化溶液进行磷化处理,以形成耐蚀性的磷酸盐转化膜。磷化溶液中含有的加速剂必须具有良好溶解性,能均匀分布在溶液中,加速剂还必须与溶液中的其它无机化合物和有机化合物相兼容,有利于形成性能优良的磷化膜。本文就含有加速剂的磷酸锌磷化溶液和磷化工艺作一介绍。 相似文献
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室温磷化加速剂的选择 总被引:10,自引:4,他引:10
采用几种金属盐,在不含其它氧化促进剂的磷化基础液里进行了试验,从而筛选出成膜速度快,耐蚀性好的钼酸盐作为室温磷化成膜加速剂,获得性能稳定的磷化法。 相似文献
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几种加速剂对磷化过程及基体腐蚀的影响 总被引:2,自引:0,他引:2
1 前言 加速剂是磷化液中不可缺少的成份,对于低温或室温磷化则尤为重要。NO_(?)~-是加速剂的基本成份,一般磷化液中都有它。对于高、中温磷化仅用NO_(?)~-就可以了,但在低、室温磷化液中还必须有一种或几种其他辅助成份,如NaNO、NaClO_3、H_2O_(?)或有机加速剂等。有机加速剂中最有效的是芳香族硝基化合物(MNBS),如硝苯酚,硝基苯磺酸(盐)等。 所谓加速,应包括两个主要含意:一是促使成膜。低、室温磷化液中如不含有效的加速剂就不能形成磷化膜或膜的质量很差,其二是促使更快的完成磷化过程,缩短磷化时间,这是自动生产线所必须考虑的问题。 此外,好的加速剂还能降低基体的腐蚀,形成薄而致密的磷化膜,提高膜的防护性、涂装性,并可以降低磷化液中有效成份的消耗,减少沉渣的生成。 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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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
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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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通过分析无缝钢管六角形堆放的原理, 提出了钢管六角形打包的简易机构设计方案。生产实践表明, 该成型机构设计合理, 使用方便; 采用该成型机构打出的钢管六角包, 在运输过程中散捆、压弯的比率大大降低。 相似文献
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D. V. Mazurova N. S. Grigoryan E. F. Akimova A. A. Abrashov T. A. Vagramyan V. I. Kharlamov 《Protection of Metals and Physical Chemistry of Surfaces》2009,45(7):838-842
A phosphatizing solution is developed for the joint treatment of steel, galvanized steel, and aluminum that allows one to
obtain adhesion crystalline phosphate layers (with masses of 2.5–2.8 g/m2) that are suitable for further cataphoretic staining at a temperature of 45–55°C. 相似文献
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