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Abstract The anodic behaviour of H68A brass in occluded condition was investigated. It is shown that in the occluded area the surface of brass remains in active state,butno autocatalytic dissolution effect can be detected.The potential of brass in occluded area becomes more noble as the concentration of Cu~+ in anolyte increases.If H~+ and Cu~+ can not diffuse outwardly from occluded area, the anodic dissolution of brass in occluded area can not take place when EE_(Cu/CuCl/Cl~-).On the other hand,if H~+ and Cu~+ can diffuse outwardly from occluded area,the anodic dissolution occurs at potential above E_(Cu/Cu_2O/H~+.The product of anodic dissolution in cavity is Cu_2O.At the same time,there are deposits formed at the mouth of the cavity by secondary reactions of Cu~+ diffused outwardly from cavity. The distribution of the corrosion products within and over the pits on brass conpenser tubes seems the latter case as mentioned above,so Cu~+ and H~+ ions must diffuse from pits toward outside in the pitting corrosion process of brass tube and hence these pits can be formed when E
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Received: 25 August 1985
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