アルミニウム腐食生成物のX線回折法による解析

抄録

The corrosion products of aluminum alloys yielded in mortar and concrete have been studied with XRD method. The corrosion products yielded in mortar contained bayerite, hydrargillite, nordstrandite and hydrated calcium aluminate. The corrosion rate was controlled by crystalline bayerite formed at the metal interface and hydrated calcium aluminate. The corrosion products yielded in concrete contained only hydrargillite which appeared to form at pH lower than 8. With an addition of 3% NaCl in mortar and concrete, the high concentration of hydroxide ions in the gel-like inner layer caused severe corrosion. Such high pH was suggested from the formation of bayerite.