요 약NaBH 4 가수 분해용 경량반응기의 재질로서 알루미늄 합금을 검토하였다. 알루미늄은 알칼리에 용해되는데, NaBH 4 반응 용액중에 안정화제로 NaOH가 포함되어 있다. 알루미늄의 부식 속도를 낮추기 위해서 NaOH 농도를 낮추면 저 장중에 NaBH 4 가 손실된다. 그래서 최적의 NaOH 농도를 결정할 때 알루미늄 부식과 NaBH 4 안정화를 모두 고려해야 한다. NaBH 4 안정화와 알루미늄 부식속도는 수소발생속도에 의해 측정하였다. Abstract − Aluminum alloy was examined as a material of low weight reactor for hydrolysis of NaBH 4. Aluminum is dissolved with alkali, but there is NaOH as a stabilizer in NaBH 4 solution. To decrease corrosion rate of aluminum, decrease NaOH concentration and this result in loss of NaBH 4 during storage of NaBH 4 solution. Therefore stability of NaBH 4 and corrosion of aluminum should be considered in determining the optimum NaOH concentration. NaBH 4 stability and corrosion rate of aluminum were measured by hydrogen evolution rate. NaBH 4 stability was tested at 20~50 o C and aluminum corrosion was measured at 60~90 o C. The optimum concentration of NaOH was 0.3 wt%, considering both NaBH 4 stability and aluminun corrosion.