Magnesium anodize bath control

Details Magnesium anodize bath control Magnesium anodize bath control

1979-03-30

1980-10-14

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

23230R, 204 1T, G01N 2742, G01N 3116, C25D 1130

Patent

active

042279763

ABSTRACT:
An analytical method to determine and control the chemical composition and oncentration of a magnesium anodizing solution consisting of three chemicals, sodium dichromate, ammonium bifluoride and phosphoric acid, such as in Chemical Treatment No. 17 of Dow Chemical Company, for example. Automatic pH titration is used to determine the amount of ammonium bifluoride (NH.sub.4 HF.sub.2) and phosphoric acid (H.sub.3 PO.sub.4) concentration at the same time and the concentration of sodium dichromate (Na.sub.2 Cr.sub.2 O.sub.7.2H.sub.2 O) is determined separately by the thiosulfate titration technique.

REFERENCES:
Dow Chemical Co. Instruction Form No. 147-39-70, exact pub. date unknown.
MIL-M-45202B, date unknown.
Ari Ivaska, Talanta, vol. 21, No. 11, pp. 1167-1173, (1974).

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