C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/77 (2006.01) C23C 22/34 (2006.01) G01N 31/16 (2006.01)
Patent
CA 2127377
The invention is a method for the accurate control of the conversion film thickness produced on aluminiferous metal mate- rials by fluorine-containing acidic conversion treatment baths; and a simple method for determining the EFC value (Effective Fluorine Concentration). The EFC value is determined by potentiometric titration of a fluorine-containing acidic conversion treatment bath having pH < 4 without prior pH adjustment using a fluorine ion electrode as indicator electrode. The titrant is an aqueous solution containing the Al ion, La ion, Y ion, Zr ion, Ga ion, Ce ion, or Be ion, an inflection point in the potential curve is used as an indication of the activity of the conversion treatment bath.
Asai Yasuo
Ishi Hitoshi
Matsubara Yazuru
Fetherstonhaugh & Co.
Henkel Corporation
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