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采用宏、微观检验和电子探针等方法对压力容器端盖电镀表面条状凸起缺陷进行了分析.结果表明,镀层表面具有方向性的条状凸起与端盖钢板中的夹层有关;经机加工后局部露出表面的夹杂在镀锌过程中与酸或镀液发生反应,生成的产物使距表面很近的薄层向外膨胀并被镀层覆盖,形成镀层表面凸起.
The defects of strip-shaped protrusions on the surface of pressure vessel end caps were analyzed by macro, microscopic inspection and electronic probe.The results show that the strip-shaped protrusions with directionality on the coating surface are related to the interlayer in the steel plate of the end caps. After the machining, the exposed part of the surface is mixed with the acid or the plating solution during the galvanizing process, and the product produced expands the thin layer close to the surface outward and is covered by the plating layer to form a convex surface of the plating layer.