The inhibiting action of some organic compounds against corrosion of CuDHP copper, aluminium brass and cupronickels (70Cu/30Ni, 90Cu/10Ni) in hydrochloric acid solutions has been studied. The aggressive media were provided by 2M HCl solutions at 90°C for weight loss determination and analysis of the dissolved elements during tests of 6 hours. For all the materials, DTU (dithiouracil) and 2,5DMc-TDA (2,5dimercapto-1,3,4thiadiazole) were particularly efficient showing inhibiting efficiencies higher than 90%. In some cases these inhibitors provoked selective dissolution of the alloys. This influence is due to the tendency of these compounds to give insoluble complexes with the copper. The interaction has been confirmed by the FTIR and EDAX analysis measurements and by the variations in the shape of the voltammograms in the presence of inhibitors.
Corrosion and corrosion inhibition of copper alloys in chemical cleaning treatments.
ZUCCHI, Fabrizio;FAGIOLI, Francesco;TRABANELLI, Giordano
1995
Abstract
The inhibiting action of some organic compounds against corrosion of CuDHP copper, aluminium brass and cupronickels (70Cu/30Ni, 90Cu/10Ni) in hydrochloric acid solutions has been studied. The aggressive media were provided by 2M HCl solutions at 90°C for weight loss determination and analysis of the dissolved elements during tests of 6 hours. For all the materials, DTU (dithiouracil) and 2,5DMc-TDA (2,5dimercapto-1,3,4thiadiazole) were particularly efficient showing inhibiting efficiencies higher than 90%. In some cases these inhibitors provoked selective dissolution of the alloys. This influence is due to the tendency of these compounds to give insoluble complexes with the copper. The interaction has been confirmed by the FTIR and EDAX analysis measurements and by the variations in the shape of the voltammograms in the presence of inhibitors.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
