采用750 ℃空气中恒温氧化和不同冷却方式在Q235碳钢表面制备了不同状态的氧化皮, 采用SEM分析氧化皮形貌, 并采用实验室加速腐蚀试验和电化学测量技术研究了裸钢和带有不同氧化皮的钢在0.5 mol/L的NaCl溶液中的腐蚀行为。结果表明,表面氧化皮的存在改变了Q235的腐蚀行为, 裸钢发生全面腐蚀, 而带氧化皮的钢在氧化皮脱落处发生局部腐蚀; 不同状态的氧化皮对Q235钢的腐蚀行为的影响也有所不同, 空冷氧化皮表面致密完整, 对基体保护性较好; 水冷氧化皮缺陷较多, 保护性较差。

Different structure scales were formed on the surface of Q235 carbon steel by isothermal temperature oxidation method at 750 ℃ in air and with different cooling methods. The micro-morphology of scales was inspected by SEM. Corrosion behaviors of Q235 carbon steel with different oxide scales were investigated in 0.5 mol/L NaCl solution by accelerated immersion corrosion test and electrochemical technique. The results show that the oxide scale changed the corrosion behaviors of Q235 carbon steel. The steel with oxide scale has the characteristics of localized corrosion. The steel with bare surface has the characteristics of general corrosion. The steel with different oxide scales had different corrosion characteristics. The oxide scale on air-cooled ateel is dense and continuous, but the oxide scale on air-cooled steel has a lot of defects. The oxide scale on air-cooled steel exhibits more excellent corrosion resistance compared with that oxide scale on water-cooled steel.