| 摘要 |
<p>Disclosed is a weld cleaning fluid composition comprising an aqueous solution having a pH that is approximately neutral, said aqueous solution having from 10% to 60% by weight of a salt of an acid selected from one or more of a phosphoric acid, nitric acid, sulfuric acid, hydrochloric acid, or citric acid, and having up to 20% by weight of a salt of a polyaminocarboxylic acid as a sequestering or chelating agent. In a preferred embodiment, the salt of an acid is a potassium or sodium orthophosphate salt and the sequestering or chelating agent is a sodium and/or potassium salt of EDTA. Also disclosed is a method of cleaning or passivating a metal surface using the weld cleaning fluid composition and an electro-cleaning apparatus.</p> |
