Title:
PHOSPHORIC CHEMICAL COATING HAVING REDUCED COATING WEIGHT AND CRYSTAL SIZE FOR METAL
Document Type and Number:
Japanese Patent JPS58133380
Kind Code:
A
Abstract:
The invention is directed to a process for determining the concentration of a grain refiner in a phosphate conversion coating bath comprising an aqueous, acidic solution containing a divalent metal phosphate, oxidizing accelerator and a grain refiner which is selected from the group consisting of acidic organic phosphates and phosphonates which have at least one free alcoholic hydroxyl group and where the organic phosphate is derived from a cyclic or branched chain organic alcohol, comprising determining the chemical oxygen demand of the bath, adding metal ion and base to a sample of the bath to raise its pH to 6.5 to precipitate the grain refiner, determining the chemical oxygen demand of the clear liquid portion of the precipitated sample, and determining the amount of grain refiner in said bath from the difference between the chemical oxygen demand values of the unprecipitated bath and the precipitated sample.
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Inventors:
KURUTO GORUTSU
Application Number:
JP883983A
Publication Date:
August 09, 1983
Filing Date:
January 24, 1983
Export Citation:
Assignee:
PENNWALT CORP
International Classes:
C23C22/08; C23C22/07; C23C22/10; C23C22/36; C23C22/77; (IPC1-7): C23F7/08
Attorney, Agent or Firm:
Motohiro Kurauchi