针对某采用地浸液为低温热源的水源热泵蒸发器铜管的穿孔问题,在模拟地浸液中对T2铜开展了全浸腐蚀试验(模拟腐蚀和加速腐蚀),通过试样的宏观和微观表面形貌,腐蚀速率和极化曲线等分析了T2铜的腐蚀行为。结果表明:地浸液中所含Cl^-对T2铜的腐蚀具有促进作用,供氧差异导致缺氧区域形成严重局部腐蚀,T2铜不宜作为地浸液的换热材料。

Aiming at the perforation problem of copper tube in an evaporator of a water source heat pump unit using in-situ leaching solution as a low-temperature heat source, full immersion corrosion tests (simulating corrosion and accelerated corrosion) were carried out to T2 copper in simulated in-situ leaching solution. The corrosion behavior of T2 copper was analyzed by macroscopic and microscopic surface morphology, corrosion rates and polarization curves of the samples. The results show that Cl^- in the in-situ leaching solution had a promotion effect on the corrosion of T2 copper, and the difference in oxygen supply led to severe localized corrosion in the hypoxic area. So T2 copper should not be used as heat transfer material for in-situ leaching solution.