Stabilisation

Details Stabilisation Stabilisation

C - Chemistry, Metallurgy

23

G

23/292

C23G 1/10 (2006.01) C01B 15/037 (2006.01) C23F 3/06 (2006.01) C23G 1/02 (2006.01)

Patent

CA 1250406

ABSTRACT Stabilisation Unless aqueous acidic hydrogen peroxide solutions are stabilised, an excessive rate of decomposition of hydrogen peroxide precludes their use for treatment of metal surfaces, such as of copper and copper alloys, during which use substantial concentrations of decomposition catalysts build- up in solution. Regular monitoring of the solutions for residual stabiliser content would demand sophisticated analytical equipment beyond the reach of many users. The invention provides a stabiliser in the form of a block of sparingly soluble material, whereby monitoring can be simply and readily effected visually or by a simple electrical or mechanical detection system. For copper/copper alloys preferred stabilisers are p-hydroxybenzoic acid and triphenyl carbinol.

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