采用电化学技术研究了高铬铁素体不锈钢447（以下称447不锈钢）在40~80℃，85%~98% H₂SO₄（质量分数）溶液中的腐蚀电化学行为。结果表明：在80℃，85%~95% H₂SO₄溶液中，447不锈钢呈现出周期性的活化-钝化腐蚀的特性，这种电化学振荡主要是由自钝化态下形成的p型半导体钝化膜的产生和溶解与电化学反应的耦合而导致的；在40~80℃，85%~98% H₂SO₄溶液中，447不锈钢的耐蚀性随温度的升高和H₂SO₄含量的减少而降低；随温度的升高，波动性加强，H₂SO₄质量分数小于98%时，随其含量的升高波动性加强，H₂SO₄质量分数不小于98%时，可使447不锈钢在H₂SO₄溶液中处于稳定的钝态，447不锈钢在自钝化态下的腐蚀主要由电荷转移步骤所控制。

Electrochemical techniques were used to investigate the electrochemical corrosion behavior of high chrome ferritic stainless steel 447 in 85%-98% (mass) H₂SO₄ solution at 40-80℃. The results show that the stainless steel 447 presented a corrosion characteristic of periodical activation-passivation in 85%-95% H₂SO₄ solution at 80℃. This kind of electrochemical oscilation was caused by the formation and dissolution of p type semiconductor passive film produced in spontaneous passive state and coupled with the electrochemical reaction. The corrosion resistance of the high chrome ferritic stainless steel 447 decreased with the increase of temperature and the decrease of H₂SO₄ content in 85%-98% H₂SO₄ solution at 40-80℃. With the increase of the temperature, the oscillation increased; when the mass fraction of H₂SO₄ was less than 98%, the oscillation increased with the increase of H₂SO₄ content, while the mass fraction of H₂SO₄ was no less than 98%, stainless steel 447 could get static passive state in H₂SO₄ solution, and the corrosion of stainless steel 447 in spontaneous passive state was controlled by charge transfer step.