Research on Pitting Corrosion and Compound Corrosion Inhibitor of T2 Copper Tube of Heat Exchanger
The failure of heat exchanger caused by T2 copper tube corrosion was taken as the engineering application back-ground.The corrosion and influencing factors of T2 copper tube of heat exchanger were studied by corrosion weight loss method,SEM and EDS,and the optimal ratio of compound corrosion inhibitors of T2 copper tube was obtained.The results show that the main cause of T2 copper pipe corrosion is the local rupture of the cuprous oxide protective film on the copper surface,resulting in galvanic corrosion of the copper at the bottom of the pit as the anode and the cuprous oxide film on the surface as the cathode,re-sulting in pitting corrosion of copper dissolution in the pit.The rupture of the oxide film is related to the deposition of excessive carbon residue,dirt(foreign matter)on the surface,mechanical damage and defects of the material itself.
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