| 摘要 |
A cleaning agent of sulfamic acid-hydroxycarboxylic acid system is provided, which has the capability of preventing metal elution from metal products to be cleaned and hydrogen embrittlement of the metal products. This cleaning agent comprises sulfamic acid and at least one of hydroxycarboxylic acids, and a compounding ratio (weight ratio) of sulfamic acid: at least one of hydroxycarboxylic acids is (60~95):(40~5), and preferably (80~95):(20~5). In particular, when citric acid and malic acid are used as the hydroxycarboxylic acids, and a compounding ratio (weight ratio) of sulfamic acid:citric acid:malic acid is (80~95):(10~2.5):(10~2.5), it is possible to provide excellent performance in preventing metal elution and hydrogen embrittlement as well as high detergency.
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