葫芦藓提取物在HCl中对X70钢的缓蚀作用研究
Corrosion inhibition action of funaria hygrometrica extracts for X70 steel in hydrochloric acid medium
研究了葫芦藓提取物(HLX)在1 mol/L盐酸中对X70钢的缓蚀能力。结果表明,HLX作为一种混合型植物缓蚀剂,能有效减缓X70钢在盐酸中阴阳极的腐蚀速率;缓蚀效率随HLX质量浓度提高而增加,随溶液温度上升而降低;当温度为 293 K、HLX质量浓度为0.8 g/L时,缓蚀效率可达93.12%。等温吸附研究表明,HLX分子可以自发地吸附在X70钢表面,且符合Langmuir吸附等温式。此外量子化学研究结果表明,HLX分子上的杂原子能与金属表面形成配位键而产生稳定的吸附。
The corrosion inhibition ability of funaria hygrometrica extracts (HLX) for X70 steel in 1 mol·L-1 hydrochloric acid medium is evaluated,and the results validate that HLX as a mixed-type corrosion inhibitor can effectively suppress both cathodic and anodic reactions of X70 steel in hydrochloric acid.The corrosion inhibition efficiency of HLX for X70 steel improves with the higher HLX concentration,and depresses with the higher solution temperature.The corrosion inhibition rate can reach 93.12% at 293 K and a HLX mass concentration of 0.8 g·L-1.It is indicated by isothermal adsorption study that HLX can be spontaneously adsorbed on X70 steel surface,which obeys Langmuir adsorption isotherm.In addition,it is shown from quantum chemical calculation that a coordination bond is built between hetero-atoms of HLX molecular and X70 steel surface,resulting in a stable adsorption.
hydrochloric acid / contact angle / funaria hygrometrica / X70 steel / corrosion inhibition
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