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Ants' nest corrosion (ANC) in thin-walled copper tubes in air-conditioning systems was first noticed about 20 years ago1). The corroded copper tubes were mainly used in heat-transfer units such as airconditioners, refrigerators, evaporators, solarsystems, radiators and condensers2). The corrosion occurred on both the interior and exterior surfaces of the copper tubes and formed meandering microtunnels in the copper tubes resulting in perforation. It has been suggested that this type of corrosion is caused by decomposition products from chlorinated organic solvents used to degrease the tubes and from some types of lubricant oil used during the copper tubing stamping process3). The decomposition products include carboxylic acids and chlorides4). More recently, volatile organic substances from vinegar-containing seasonings5), cosmetics, synthetic building materials, woods, insecticides and paints have been suspected as causes of the corrosion6). The localized corrosion was first simulated by the author in vitro in a humid atmosphere in the presence of carboxlic acids and aldehydes7),8). The morphology of this corrosion in copper tubes differs according to the type of corrosive substance. Severity of corrosion and morphological change with different types of aldehydes have been studied9). A Ginkgo fruit has a strong smell, and juice from the fruit irritates the skin. It has been thought that this volatile organic substance in ginkgo fruit may cause corrosion of metals and alloys. In this report, the severity and morphological features of ANC caused by ginkgo fruit juice are described.

Localized ^|^ldquo;Ants' Nest^|^rdquo; Corrosion in Copper Tubes Caused by Ginkgo Fruit Juice