热浸镀锌层有机物-无机物复合钝化工艺及其性能

本文讨论了热浸镀锌层有机物-无机物复合钝化工艺及其性能的相关思考。首先,介绍了锌镀层及其钝化工艺的概述,接着,深入探讨了热浸镀锌层有机物-无机物复合钝化工艺的原理,随后,对与热浸镀锌层有机物-无机物复合钝化工艺相关的影响因素进行了研究,进一步,阐述了热浸镀锌层有机物-无机物复合钝化工艺的优化与改进,最后,提出结论并展望未来进一步研究的方向和挑战。

无机物、有机物钝化技术

热镀锌(电镀锌)钢板不仅具有优良的加工性能,而且具有优良的防腐蚀能力,因此在工业领域得到了广泛应用。热镀锌钢板一般需要钝化处理,使其表面生成一层致密度、稳定性较高的薄膜,以提高其抗蚀性能,增加镀锌板表面的光泽性和抗污染能力。目前普遍采用的铬酸盐钝化处理工艺,具有工艺简单、膜结合力好、耐蚀性高及自我修复能力好等特点。通过铬酸盐钝化处理后的热镀锌钢板,可在其金属表面形成一层铬/基体金属混合氧化物膜层,并且所得到的钝化膜是一个网络结构。这个网络结构是以三价铬为骨架,部分六价铬和凝胶物质形成薄膜。但是其中六价铬是致癌物质,会影响到人体以及环境污染。因此,铬酸盐的使用和排放受到了严格限制。根据欧盟于2003年正式公布的《关于电子电气设备中禁止使用某些有害物质指令》(RoHS),产品中禁止使用六价铬,所以解决六价铬的污染问题,开发研究新型钝化工艺技术,摈弃传统的铬酸钝化工艺,是金属钝化技术的创新,是推行绿色工业技术、保护环境的形势所需。

镀锌产品无铬钝化技术研究进展

纯镀锌产品耐腐蚀性不强,对镀锌件进行无铬钝化,有利于提高其耐腐蚀性能,同时还有利于环境保护。为此,从无机物和有机物两方面综述了当今无铬钝化镀锌产品的研究现状,并展望了今后的发展方向。

镀锌层无铬钝化技术研究进展

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。

无铬钝化技术的发展和ZECCOAT无铬钝化工艺

介绍了无铬钝化技术的发展概况,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。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。中性盐雾试验出现白锈时间,直接采用ZECCOAT钝化,碱性镀锌为96 h-168 h,酸性镀锌为96 h-120 h;采用三价铬钝化加ZECCOAT钝化,碱性镀锌为648 h-936 h,酸性镀锌为192 h-504 h。ZECCOAT钝化膜性能和钝化成本与三价铬钝化加封闭工艺相当。

Inorganic material passivation of defects toward efficient perovskite solar cells

Surface passivation with organic materials is one of the most effective and popular strategies to improve the stability and efficiency of perovskite solar cells(PSCs). However, the secondary bonding formed between organic molecules and perovskite layers is still not strong enough to protect the perovskite absorber from degradation initialized by oxygen and water attacking at defects. Recently, passivation with inorganic materials has gradually been favored by researchers due to the effectiveness of chemical and mechanical passivation. Lead-containing substances, alkali metal halides, transition elements, oxides,hydrophobic substances, etc. have already been applied to the surface and interfacial passivation of PSCs.These inorganic substances mainly manipulate the nucleation and crystallization process of perovskite absorbers by chemically passivating defects along grain boundaries and surface or forming a mechanically protective layer simultaneously to prevent the penetration of moisture and oxygen, thereby improving the stability and efficiency of the PSCs. Herein, we mainly summarize inorganic passivating materials and their individual passivation principles and methods. Finally, this review offers a personal perspective for future research trends in the development of passivation strategies through inorganic materials.