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US5518555A Chromium and fluoride free metal treatment 失效
铬和氟化物的金属处理

Chromium and fluoride free metal treatment
摘要:
A heavy metal and fluoride free pretreatment for a metal surface which enhances corrosion resistance and surface adhesion properties is described. The pretreatment is an aqueous solution of an anionic polyacrylamide which can be rinsed or dried in place.
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