C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/17
C23C 22/17 (2006.01) C23C 22/23 (2006.01) C23C 22/47 (2006.01)
Patent
CA 1233733
29 Solution and process for the chemical conversion of metal substrates. A B S T R A C T Acid solution for the chemical conversion of metallic substrates, comprising : - a polyphosphate, soluble in water and of the formula (X PO3)n in which n ? 3 and in which X is an alkali, alkaline earth metal or ammo- nium, - an organic chelating agent and - the zinc ion, the pH being brought to the desired value by means of an inorganic acid selected from the group comprising sul- phuric hydrochloric and nitric acid.
433588
Boulinguiez Didier
Gosset Serge
Lumaret Jean-Claude
Goudreau Gage Dubuc
Roquette Freres
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