利用超声喷丸技术制备了表面纳米化低碳钢.结构分析表明,最表层低碳钢的晶粒尺度在20nm左右,随着向基体方向靠近,纳米层晶粒尺度逐渐增加.对纳米低碳钢在0.05 mol/LH2SO4+0.05 mol/LNa2SO4腐蚀介质中腐蚀速度测试结果表明,纳米化后低碳钢的腐蚀增加;纳米低碳钢的电化学腐蚀行为存在尺寸效应.在晶粒尺度小于35nm时,纳米低碳钢的电化学腐蚀速度随晶粒尺度的增加而降低,当晶粒尺度高于35 nm后,晶粒尺寸对腐蚀速度影响不大.纳米化后低碳钢的阳极反应历程不变,阳极交换电流密度提高;而阴极反应历程改变,析氢反应容易,并由电化学步骤控制转变为由扩散步骤控制.纳米化后低碳钢阴阳极反应同时得到促进,腐蚀速度增加.
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