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US4886616A Aluminum surface cleaning agent 失效
铝表面清洗剂

Aluminum surface cleaning agent
摘要:
Chromium free cleaning compositions for cleaning aluminum and aluminum alloy surfaces comprisingA. from 0.2-4 g/l ferric ion andB. sufficient sulfuric and/or nitric acid to produce a pH of 2 or less.The invention also relates to compositions containing from 0.001-0.5 g/l of fluoride ions.
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