空调制冷铜管“铜铝渗蚀”开裂失效分析

空调换热器制冷铜管在安装数月后出现开裂泄漏制冷剂现象。对开裂的管材进行化学成分、力学性能、断口及金相检验分析。结果表明,Al-Cu渗蚀导致铜管底壁变薄,装配、运转应力导致开裂。追踪生产过程,发现火焰自动钎焊工艺中存在的Al-Cu渗蚀现象为铜管底壁变薄主要原因,据此提出相应的有效解决方案。

Failure analysis of the Al-Cu diffusion corrosion of refrigeration copper tube for air-conditioning

Economic ethics is an important issue in social sciences,especially when corruption problems resulting from ethical degradation receive an ever-increasing attention.This essay analyzes the breeding and prevention of corruptions from the perspective of economic ethics and the construction of a decision-making model.It suggests that the process of corruption generation is that of executive administrators’ decision-making based on their expected profits,the core of which is an internal game between economic gains and economic ethics.Corruption prevention must be implemented in three aspects at the same time： legal adjustments,supervision system and ethical regulations.These measures are expected to increase the cost of corruption,and to decrease the expected profits,so as to radically prevent corruptions.