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中文摘要：
采用失重法,极化曲线,电化学阻抗谱和扫描电子显微镜研究木质素磺酸钠（SLS）在质量分数为3.5%NaCl溶液中对AZ31镁合金的缓蚀作用。结果表明：在298 K时SLS可有效抑制AZ31在Na Cl介质中的腐蚀。当SLS为4.0 g·L-（-1）时,缓蚀率可达到最大。提高浓度后,其缓蚀率会下降。SLS是阴极型缓蚀剂,并且SLS在AZ31表面的吸附符合Langmuir吸附模型。由吸附自由能△G-0及Arrhenius活化能E_a可知,SLS在AZ31镁合金表面是化学吸附。
英文摘要：
The inhibition effects of sodium lignosulphonate（SLS） on corrosion of AZ31 magnesium alloy in 3.5% Na Cl have been studied by a mass loss method, potentiodynamic polarization, electrochemical impedance spectroscopy（EIS） and scanning electron microscopy（SEM）. The results show that SLS can inhibit effectively the corrosion of AZ31 magnesium alloy in 3.5% Na Cl solution at 298 K. When SLS concentration is 4.0 g·L（-1）, the inhibition efficiency is up to the highest, 75.4%. However, further increase in SLS concentration will decrease the inhibition efficiency. SLS is an anion inhibitor; the adsorption of SLS on the AZ31 magnesium alloy surface obeys the Langmuir adsorption isotherm, which is chemical adsorption based on the adsorption free energy △G-0and the Arrhenius active energy E_a.
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