| 摘要 |
1472029 Oxalate conversion coatings DALMINE SpA 29 Oct 1975 [11 Nov 1974] 44533/75 Headings C7E and C7U In an oxalic acid conversion coating process for stainless steel the process is controlled by measuring the electro-potential of the article. A stainless steel tube is first oxidized by heating at 1050‹C, and then pickled in a solution comprising, per cent by wt., 6HF, 12HNO 3 , 15H 2 SO 4 . |
