アルミニウム青銅の腐食現象

Abstract

Corrosion of binary Cu-Al alloys was investigated in sea water. Single phase specimens of α, β′ or γ2 respectively were prepared and tested on corrosion loss, corrosion potential, polarization characteristics and cathodic protection.The results were as follows:1) In α phase, corrosion loss decreased as Al content increased.2) In β′ phase, corrosion loss was less than in α and γ2 phases, and passivity was observed in the anodic polarization curves between 10 and 70μA/cm2.3) In γ2 phase, dealuminization and redeposit of Cu were observed.4) The current density and the potential for cathodic protection of α phase castings were 10μA/cm2 and-0.4V (vs. S. C. E.).