对Q235、Q345 及镀锌钢在中性盐雾箱中连续喷雾2、6、24、48、72、144、240、360 h，研究了在模拟海洋大气下3 种材料的腐蚀产物组成和形态随时间的演变规律． 通过失重法计算腐蚀速率，并用XＲD 和SEM 对腐蚀产物进行表征． 结果表明: 3 种钢材的腐蚀动力学曲线遵循指数函数规律; 其中镀锌钢的腐蚀速率远远低于碳钢，而两种碳钢的腐蚀速率很接近; Q235 和Q345 钢的腐蚀产物主要有α-FeOOH、β-FeOOH、γ-FeOOH 和Fe₃O₄，其随着喷雾时间的延长呈现不同的变化规律; 不同腐蚀产物呈现不同的形貌特征，γ-FeOOH 为花片状，β-FeOOH 为棉花状，报道较少的Fe₃O₄为尖晶石状; 相比于两种碳钢，镀锌钢的锈层则更加密实．

In order to investigate the evolution of the composition and form of steel corrosion products with time in simulated marine atmosphere,Q235,Q345 and galvanized Q235 steels were exposed in neutral salt spray boxes for 2,6,24,48,144,240,360h.Then,the corrosion rates were calculated via the weight loss method,and the corrosion products were characterized by means of XRD and SEM.The results show that ( 1) the corrosion kinetics curves of the three kinds of steels follow the bilogarithmic equation; ( 2) the galvanized Q235 steel has a much lower corrosion rate than Q235 and Q345 steels,while the corrosion rate of Q235 steel is close to that of Q345 steel; ( 3) the corrosion products forming on Q235 and Q345 steels are mainly α-FeOOH,β-FeOOH,γ-FeOOH and Fe₃O₄ ,and the change rules of these products with the spraying time are different; ( 4) different corrosion products exhibit different topographic characteristics,specifically,γ-FeOOH ,β-FeOOH and less reported Fe₃O₄ are respectively flower-like,cotton ball-like and spinelle-like; and ( 5) as compared with the two kinds of carbon steels,the galvanized Q235 steel has a more compact rust layer.