| 摘要 |
<p>Metal cleaning and protection process.. M7-. For removing rust and preventing corrosion, is treatment with soln. of HCl, phosphoric acid (or source), at least 1% (pref. 1-10%); and organic acid (esp. citric acid, pref. 2-25g/l), pref. 2-3 mins. at 54 degrees C, water rinsing and drying.</p> |
