抄録
The corrosion products formed on copper in borate-boric-acid solution were examined using the combined method of immersion tests and ESCA, IMMA, electron microscopy and FT-IR spectroscopy. After exposure for a short period, the film was composed of cuprous oxide (Cu2O) with a small amount of cupric compound. On the other hand, after exposure for a long time, the final product was largely composed of a mixture of anhydrous and hydrous cupric compound (copper borate a material like Cu(BO2)2·mH2O or CuB4O7·nH2O). This cupric compound was a bluish-green fine crystal. The outermost part of the film had a small quantity of impurities and adsorbed contaminations such as H, C, Ca, Na, Mg, Al, Si, P, K, SiO, Ti, Cr and Fe. These contaminators are probably not significant constituents of the corrosion products. In addition, corrosion pits were formed at non-metallic inclusion such as Si.
