モルタル中におけるアルミニウム合金の腐食に及ぼすナトリウムとカルシウムイオンの影響

概要

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Corrosion of Aluminum alloys in mortar containing sodium,calcium and chloride ions have been studied by weigh loss and electrochemical measurements. The ions were added into mortar in the amount of 3%CaCl_2 and 3%NaCl. The corrosion product of aluminum alloys in mortar containing 3%CaCl_2 was identified as 3CaO・Al_2O_3・8H_2O by X-ray diffraction. The corrosion was inhibited by precipitation of the corrosion product and the rate of corrosion was almost proportional to the passivation current. When both 3%CaCl_2 and 3%NaCl were added in mortar,the corrosion product was found to be trihydrated aluminum oxide. The corrosion weigh loss was approximately 3 times that in mortar containing 3%CaCl_2 and one-fourth that in mortar containing no CaCl_2 nor CaCl. It is concluded that calcium ions inhibit and sodium ions accelerate the corrosion of aluminum alloys in mortar.
社団法人日本材料学会の論文
1986-11-15