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Cement particle induced failure of cold potable water copper plumbing

机译:水泥颗粒引起的冷饮用水铜管失效

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摘要

Use of copper tubing in water distribution system reportedly dated back to the ancient Egyptians who used copper pipe rolled from sheets. Copper is known to be relatively corrosion resistant in potable water and widely used as domestic plumbing material. However, the insidious and unpredictable internal pitting corrosion, although rare, is identified to be the leading cause of domestic copper plumbing failure in potable water system [1-5]. The pinhole leakage of copper tubing in cold potable water distribution due to pitting corrosion is in general found to be induced by either aggressive water chemistry (typically pH of 7.0-7.7 and dissolved carbon dioxide of at least 25 mg/L) or soldering flux. Severe corrosion of copper in the presence of aluminum and chlorine also evidently lead to the pinhole leakage of copper as has been revealed in recent studies [5-10].
机译:据报道,在供水系统中使用铜管可以追溯到古埃及人,他们使用的是用薄板轧制的铜管。众所周知,铜在饮用水中相对耐腐蚀,并广泛用作家用管道材料。然而,隐患和无法预测的内部点蚀虽然很少见,但已被确定是饮用水系统中家用铜管道故障的主要原因[1-5]。通常发现,铜铜管由于点蚀而在冷饮用水中的针孔泄漏是由侵蚀性的水化学作用(pH值通常为7.0-7.7,溶解的二氧化碳至少为25 mg / L)或助焊剂引起的。如最近的研究[5-10]所示,在铝和氯的存在下,铜的严重腐蚀也明显导致铜的针孔泄漏。

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