One heritage corrosion product less: Basic sodium copper carbonate

Abstract

Basic sodium copper carbonate, Na 3 [Cu 2 (CO 3 ) 3 (OH)]·4H 2 O, has been mentioned as heritage corrosion product of copper alloys in two publications. The identification relied on the comparison of the powder diffractograms with ICDD 28-1048. But this erroneous reference card clearly measured chalconatronite, Na 2 Cu(CO 3 ) 2 ·3H 2 O, instead which is indeed the product formed in the synthesis on which the card is based. Therefore, ICDD 28-1048 should be deleted.