アルミニウム青銅の腐食現象

抄録

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.).