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首页> 外文期刊>Corrosion Engineering, Science and Technology >Galvanically assisted crevicing of electroplated chrome press cylinders
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Galvanically assisted crevicing of electroplated chrome press cylinders

机译：电镀铬压缸的电辅助缝制

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摘要

Printing press cylinders release ink that is stored in a surface pattern of micro-indentations. The cylinder consists of a steel substrate electroplated with a layer of copper. A micro-indentation pattern is applied followed by a 10 μm top layer of electroplated chrome. This layer generally contains microcracks at a rate if 1000 cracks/2.5 cm. Chrome flaking was common during the warm summer months, leading to costly shutdowns. Corroded cylinders were examined using optical and scanning electron microscopy, energy dispersive spectroscopy, corrosion potential measurement and chemical analysis. It was found that rapid crevicing was taking place in the microcracks. At the chrome/copper interface, galvanically assisted crevicing further accelerated the flaking process. It was also found that the percentage of micro-indentations found to exhibit corrosion spots correlated well with measured corrosion potentials. Polymeric storage covers were recommended to limit atmospheric sources of moisture, oxygen, chlorides and sulphates.
机译：印刷机滚筒会释放墨水，这些墨水以微压痕的表面图案存储。圆柱体由电镀有一层铜的钢基底组成。施加微压痕图案，然后施加10μm的电镀铬顶层。该层通常以1000裂纹/2.5 cm的速率包含微裂纹。铬的剥落在炎热的夏季很普遍，导致昂贵的停机费用。使用光学和扫描电子显微镜，能量分散光谱，腐蚀电位测量和化学分析检查了腐蚀的圆柱体。发现在微裂纹中发生了快速裂缝。在铬/铜界面，电镀辅助的开裂进一步加速了剥落过程。还发现发现有腐蚀斑点的微压痕百分比与测量的腐蚀电位很好地相关。建议使用聚合物存储盖来限制大气中的水分，氧气，氯化物和硫酸盐。

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