Effects of Debris and Residual Carbon Film in Circulated Water Containing a Corrosion Inhibiter on Pitting Attack of Copper Tubes for Air Conditioning System

Abstract

Electrochemical measurements and surface observations have been made to clarify the effects of debris and residual carbon film in circulated water on corrosion behavior of copper tube for air conditioning system. Proper usage of water treatment agent has kept tube surface corrosion-resistant, regardless of surface with or without residual carbon film. It is electrochemically and morphologically indicated that debris such as corrosion product in circulated water causes damages of the tube surface and then leads to occurrence of localized corrosion such as pitting attacks in some situations.