动态热海水中碳钢材料缓蚀剂的研究

Study of the inhibitors of the carbon steel in dynamic hot seawater

为提高碳钢材料在动态热海水中的耐腐蚀性能,优选了葡萄糖酸钠等3种成分组成的复合缓蚀剂考察其缓蚀效果和作用机理.采用模拟海水成分及动态试验条件下测试缓蚀剂对碳钢的缓蚀率,利用阳极极化曲线和扫描电镜研究复合缓蚀剂对钢铁材料在模拟海水中腐蚀过程的影响规律.实验结果表明,复合缓蚀剂各组分之间具有协同效应,在80℃动态海水中对碳钢的缓蚀率为85.8%,在25℃静态海水中对碳钢的缓蚀率可达94.5%.复合缓蚀剂提高动态热海水环境中钢铁耐腐蚀性能的主要原因是可在其表面形成一层致密的缓蚀钝化膜.

In order to improve the corrosion-resistant property of carbon steel in seawater, a compound inhibi- tor included sodium gluconate was investigated. The inhibitory efficiency was determined by simulating the corrosive circumstance of the carbon steel in fluid hot seawater. The surface morphologies were studied by scanning electron microscopy （SEM）. And the inhibitory mechanism was discussed by the anodic polarization curves of carbon steel in dynamic hot seawater. The results showed that there was cooperation action among the inhibitors. The inhibitory efficiency of the compound inhibitor for carbon steel was 85.8% in dynamic seawater of 80 ℃ and 94. 5% in static seawater of 25 ℃, respectively. The addition of the compound inhibitor resulted in the formation of a compact passive film on the surface of carbon steel, which improved the corrosion-resist-ance of carbon steel in dynamic hot seawater.