アルカリ性浴中におけるアルミニウムの腐食に及ぼす多価アルコール類添加の効果について

概要

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Studies on corrosion inhibitors for aluminum immersed into alkaline media have been made by use of various materials. In this paper, the addition effect of polyhydroxy-alcohols, especially of sorbitol and mannitol, on the corrosion of aluminum in alkaline media was studied. In case of addition of such polyhydroxy-alcohols, the values of pH, temperature and the concentration of additives affect the corrosion rate of aluminum. By the addition of polyhydroxy-alcohols, the inhibition of corrosion for aluminum was not seen under pH 9∿10,but the inhibition or promotion behaviors were seen under pH 8 or pH 10. The corrosion of aluminum in alkaline media is considered to take place under anodic control and the reaction is at the rate process. The inhibition mechanism in case of adding soroitol and mannitol in alkaline media is considered to be due to film forming on the surface of aluminum. The behavior of iron was also studied. Sorbitol and mannitol play part to remove iron precipitated on the surface of aluminum. The presence of iron powder inhibits the corrosion of aluminum. The authors thank the award of National research fund of the Department of Education.
山梨大学の論文