Alkalizing agents cyclohexylamine, morpholine, and hydrazine accelerate the base-induced decomposition of Fe(OH) 2 even at high pH levels by lowering the activation energy of the reaction. Efficient evolution of hydrogen is observed from Fe(OH) 2 suspension in the presence of hydrazine, while weakly stimulated evolution is observed in the presence of cyclohexylamine and morpholine. It appears that the concentration and complexing abilities of the additives critically determine the yield of hydrogen. Nickelcontaining surfaces such as NiO and Monel 400 † alloy (UNS N04400) apart from pure nickel also increase the H 2 yield from Fe(OH) 2 suspensions. These observations are related to corrosion occurring in the low-temperature portion of feedwater circuits of power plants.