共查询到16条相似文献,搜索用时 105 毫秒
1.
2.
3.
4.
5.
总结了镀锌产品无铬钝化技术的发展状况。无铬钝化分为无机物钝化和有机物钝化两个体系,大部分工艺还处于实验室研究阶段。介绍了ZECCOAT无铬钝化工艺的应用。该工艺采用了高科技纳米技术,钝化溶液无毒,钝化膜薄,具有自修复性,耐腐蚀性高。生产实践表明,ZECCOAT无铬钝化满足汽车零配件的性能要求。 相似文献
6.
7.
8.
热镀锌板无铬钝化技术研究进展 总被引:1,自引:1,他引:0
采用传统的铬酸盐钝化处理技术,能够在金属表面获得一层耐蚀性能优异且具有自修复性的钝化膜。但是由于六价铬毒性很大,对人类的健康有很大危害,近年来六价铬钝化工艺已经被限制使用,因此开发新型环保的无铬钝化技术已成为目前的研究热点。现有热镀锌板的无铬钝化工艺可大致分为有无机钝化、有机钝化、无机/有机复合钝化三种类型。详细介绍了这三种无铬钝化类型的机理及其研究进展,主要阐述了现有制备镀锌板表面无铬钝化膜层的钼酸盐钝化、钨酸盐钝化、硅酸盐钝化、植酸钝化、单宁酸钝化、有机硅烷钝化、有机树脂钝化和无机盐/有机树脂复合钝化等工艺的原理,并对这几种无铬钝化工艺的特点进行了总结,阐明了不同无铬钝化工艺获得的钝化膜层的结构特点。通过与铬酸盐钝化膜的性能相比较,进一步分析了各种无铬钝化膜层的优缺点。最后提出综合利用无机钝化和有机钝化的优点,研发新型环保的无机/有机复合钝化处理工艺是热镀锌钢板无铬钝化技术未来的发展趋势。 相似文献
9.
10.
11.
12.
13.
PassivationofInsolubleAnodefromTi-baseAlloysinPreparationofElectrolyticMnO_2YuZhengandYangShengshu(俞征)(杨生恕)DepartmentofChemis... 相似文献
14.
Investigation into the active/passive transition of 304 stainless steel in organic media containing water Part 2: Influence of water on the active dissolution and passivation The influence of water on the corrosion and passivation of type 304 stainless steel has been studied in deaerated ethanolic solutions containing hydrogen chloride. The potentiostatic polarisation curves show that both, critical current density for passivation and passivation potential, strongly depend on the water content of the solution. A passivation model based on the assumption of a reversible primary passivation potential explains this influence of water and allows the determination of other kinetic parameters. The propounded passivation model also explains the result that the part of “passivated” surface at the maximum current density is the same for all water contents examined. The dominating influence of the water content is shown more clearly when measurements from methanolic and propanolic solutions are concerned. The passivation potential only depends on the water content and not on the type of alcohol. 相似文献
15.