| 摘要 |
<p>A sulfamic acid/hydroxycarboxylic acid detergent with which a metallic product can be cleansed while preventing it from releasing a metal and from suffering hydrogen embrittlement. The detergent comprises a sulfamic acid and at least one hydroxycarboxylic acid in a proportion of (60 to 95)/(40 to 5) by weight, preferably (80 to 95)/(20 to 5) by weight. Especially when the detergent contains citric acid and malic acid as the hydroxycarboxylic acids in such amounts that the proportion of sulfamic acid/citric acid/malic acid is (80 to 95)/(10 to 2.5)/(10 to 2.5) by weight, then the detergent has high detergency and the effect of preventing hydrogen embrittlement and metal release is maximized.</p> |
