Surface analysis with ESCA and GD-OES of the film formed by cathodic reduction of chromate

• In the chlorate process, a small addition of chromate to the electrolyte results in the formation of a cathode film, which inhibits the reduction of the intermediate hypochlorite ions. To enable surface characterization of the chromium film, it was grown by cathodic reduction onto gold and platinum substrates in hydroxide and chlorate solution. Surface analyses of this film by ESCA and GD-OES indicate that it has a distinct and constant chemical composition during growth given by the formula Cr(OH)3·xH2O. The film is thin, less than 50 Ã… on platinum and 80 Ã… on gold. It exhibits poor conductivity and covers the entire cathode surface. © 1991.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Kemiteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Chemical Engineering (hsv//eng)

Keyword

chlorate

chromium hydroxide film

ESCA

GD-OES

sodium hydroxide.

Publication and Content Type

ref (subject category)

art (subject category)