Cleaning of ferrous metal surfaces |
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| 申请号 | US3627687D | 申请日 | 1968-02-09 | 公开(公告)号 | US3627687A | 公开(公告)日 | 1971-12-14 |
| 申请人 | DOW CHEMICAL CO; | 发明人 | TEUMAC FRED NORMAN; SCRUGGS JAMES SCOTT; | ||||
| 摘要 | The invention is based on the discovery that upon adding a polyamine having intralinear amino groups to an aqueous alkaline solution of an ammoniated or aminated polycarboxylic acid chelating agent, a new and improved metal-cleaning solution is provided. Upon bringing such cleaning solution into contact with a ferrous metal surface having hardness and/or iron oxide scale, and copper, thereon and the solution being maintained at a temperature above about 155* C. for a time sufficient to dissolve all the hardness and iron oxides, the copper is dissolved and neither precipitates from solution nor deposits on the ferrous metal surface. | ||||||
| 权利要求 | 2. The composition as in claim 1 which contains a corrosion inhibitor selected from the group consisting of sodium mercaptobenzothiazole, di-aminoethyl sulfide, the product of reaction of (1) one mole of an ammonia derivative having at least one hydrogen attached to nitrogen and having no groups reactive under the conditions of reaction other than hydrogen, (2) from 1.5 to 10 moles of a ketone having at least one hydrogen atom on the carbon atom adjacent to the carbonyl group, (3) from 2 to 10 moles of an aldehyde selected from the group consisting of aliphatic aldehydes having from 1 to 16 carbon atoms and aromatic aldehydes of the benzene series and having no functional groups other than aldehyde groups, and (4) from 0.6 to 24 parts by weight based on (1), (2), and (3) of a fatty acid having from 1 to 20 carbon atoms, at a temperature of from about 150* to about 250* F. for from 1 to 16 hours, and mixtures thereof. |
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