在[H_2SO_4]和[SO_4~(2-)]恒定的不同浓度Cr_2(SO_4)_3溶液中测定了Cr~(3+)在光滑Pt和PbO_2电极上的稳态极化曲线和分解极化曲线,得到了氧的阳极发生和Cr~(6+)阳极形成的动力学数据,提出了Cr(Ⅵ)是由Cr(Ⅲ)通过“活性氧”的氧化形成的反应机理。测得了PbO_2电极上不同过电位下电极反应的有效活化能,其数值均在41.9kJ/mol以上,且随着极化的增大而减小, The steady-state polarization curves and decomposition polarization curves of Cr 3+ on smooth Pt and PbO 2 electrodes were measured in different concentrations of Cr 2 (SO 4) 3 solutions with constant concentrations of [H 2 SO 4] and [SO 4 2-] The kinetic data of the formation of oxygen anode and Cr 6+ anode were obtained. It is proposed that Cr (VI) is formed by the oxidation of Cr (III) by “reactive oxygen species”. The effective activation energy of the electrode reaction at different overpotential on PbO_2 electrode was measured, its value was above 41.9kJ / mol and decreased with the increase of polarization,