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丹麦工业大学的马亨博士(Dr.E.Maahn)谈起过一件有趣的腐蚀事例:丹麦有一个教堂,钟楼的屋顶是铜的,厚0.8mm,盖了才三年便腐蚀穿孔了。检查腐蚀的原因,原来是支撑屋顶的木桁架曾经用硫酸铵、磷酸氢铵等溶液进行过防火处理,靠近屋顶部分凝析的水溶解了处理木材时吸收的铵盐,滴到水泥地上,和水泥中的硷相反应而放出氨,氨是能腐蚀铜的,这一事故便是处理木材的铵盐所引起的! 最近笔者在武汉参加了一次表面保护会
Dr.E.Mahahn of the Danish University of Technology talked about an interesting example of corrosion: there is a church in Denmark, the roof of the clock tower is copper, 0.8mm thick, and only three years after it is corroded and perforated. Check the cause of corrosion, the original is to support the roof of the wooden truss has been treated with ammonium sulfate, ammonium hydrogen phosphate and other fire-resistant treatment, near the roof of the condensate water dissolved timber treatment absorbed ammonium salts, drops to the concrete floor, and Cement alkaline reaction and release of ammonia, ammonia is able to corrode copper, the accident is caused by dealing with the ammonium salt of wood! Recently, I participated in a surface protection in Wuhan