65Mn高弹性垫片的机械镀锌研究

发布时间：2018-11-15 14:26

【摘要】：目的克服65Mn高弹性垫片电镀锌产生的氢脆问题。方法采用机械镀锌方法在65Mn高弹性垫片表面制备了镀锌层,采用目测法观察镀层的外观及镀层完整情况,采用硫酸铜试验分析镀层厚度的均匀性,采用划格试验法测试镀层的结合强度,采用铁试剂方法检测镀层的孔隙率,通过预紧固检测分析了镀液p H值对镀后垫片氢脆的影响,采用中性盐雾实验法检测了钝化对镀层耐蚀性能的影响。结果制备的机械镀锌层表面平滑,覆盖完整,无起皮、漏镀等缺陷。镀层呈灰亮色,厚度均匀,具有足够的致密度。当镀液环境的p H值较低时(1~2和2~3),施镀过程造成一定程度的氢脆隐患;镀液环境的p H值为3~4时,机械镀锌垫片不会发生裂纹或断裂。结论施镀时,镀液环境的p H值调整为3~4,或垫片在镀锌后装配前自然放置1~2周,采用机械镀锌的方法可消除65Mn高弹性垫片镀锌过程中的氢脆现象。钝化处理可推迟或防止65Mn高弹性垫片机械镀锌层白锈的产生。
[Abstract]:Objective to overcome the problem of hydrogen embrittlement caused by zinc plating on 65Mn high elastic gasket. Methods the zinc coating was prepared on the surface of 65Mn high elastic gasket by mechanical galvanizing. The appearance and integrity of the coating were observed by visual method. The uniformity of coating thickness was analyzed by copper sulfate test. The bonding strength of the coating was measured by grid test, the porosity of the coating was measured by the iron reagent method, and the effect of pH value of the plating solution on the hydrogen embrittlement of the gasket after plating was analyzed by pre-fastening test. The effect of passivation on corrosion resistance of coatings was investigated by neutral salt spray test. Results the surface of the mechanically galvanized coating was smooth, complete covering, no peeling, leakage plating and other defects. The coating is of gray color, uniform thickness and sufficient density. When the pH value of bath environment is low (1 / 2 and 2 / 3), the process of plating causes a certain degree of hidden danger of hydrogen embrittlement, and when pH value of bath environment is 3 ~ 4, the crack or fracture will not occur in mechanical galvanizing gasket. Conclusion when the pH value of bath is adjusted to 3 ~ 4, or the gasket is placed naturally for 1 ~ 2 weeks before galvanizing, the hydrogen embrittlement phenomenon in the zinc plating process of 65Mn high elastic gasket can be eliminated by mechanical galvanizing. Passivation treatment can delay or prevent the formation of white rust in mechanical galvanizing of 65Mn high elastic gasket.
【作者单位】：广东兴发铝业有限公司;佛山市嘉荣智能机械有限公司;昆明理工大学;
【分类号】：TG174.4;TQ153.15

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