木质素磺酸钠对3.5%NaCl溶液中AZ31镁合金的缓蚀作用  

Inhibiting Effect of Sodium Lignosulphonate on the Corrosion of AZ31 Magnesium Alloy in NaCl Solution

作　　者：肖涛[1] 党宁[1] 侯利锋[1] 卫英慧[1] 郭春丽[1] 杜华云[1] 

机构地区：[1]太原理工大学,山西太原030024

出　　处：《稀有金属材料与工程》2016年第6期1600-1604,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51001079;21201129;51374151);山西省自然科学基金(2011011020-2)

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。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.

关 键 词：镁合金 木质素磺酸钠 缓蚀剂 NACL溶液 

分 类 号：TG174.42[金属学及工艺—金属表面处理]