碱溶液中添加剂对铝阳极行为的影响

为了提高铝活化性能以及降低析氢腐蚀，用电化学方法研究了在4mol／LKOH溶液中，添加剂酒石酸钾钠（C4H4O6KNa）、邻氨基苯酚（NH2C6H4OH）以及复合添加剂对铝阳极（W（AJ）=99．999％）电化学行为的影响。结果表明：C4H4O6KNa对抑制铝的析氢腐蚀作用不大，但大幅度提高铝阳极的活性。添加NH：C6H40H，主要作用是大幅度抑制铝的析氢腐蚀，对铝活性几乎无影响。复合添加剂（C4H4O6KNa＋NH2C6H4OH＋KMnO4）能明显降低铝阳极在碱性介质中的极化，提高其活性，同时析氢腐蚀也降低，其最佳配方为：15mmol/L C4H4O6KNa＋0．4mol／LNH2C6H4OH＋0．8mmol／LK2MnO4。

Effect of additives on behavior of aluminum anode in alkaline solution

To improve hydrogen evolution rates and activation properties of Al,effects of additives of C_4H_4O_6KNa,NH_2C_6H_4OH and their complex on electrochemical behaviors of aluminum anode(99.999%)in 4 mol/L KOH solution have been carried out by using electrochemical methods.It has been shown that activation properties of Al are largely improved when C_4H_4O_6KNa being added into 4 mol/L KOH,but hydrogen evolution corrosion of aluminum is almost hardly inhibited.Furthermore,it has been found that corrosion rate of Al sharply decreases when NH_2C_6H_4OH is added into 4 mol/LKOH,but activation properties of Al don't increase.Finally,when optimal formula of complex additives are composed of 15 mmol/L C_4H_4O_6KNa 0.4 mol/L NH_2C_6H_4OH 0.8 mmol/L K_2MnO_4,both activation properties and hydrogen evolution corrosion of Al are largely improved.