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Performances of Alkaloid Extract from Rauvolfia macrophylla Stapf toward Corrosion Inhibition of C38 Steel in Acidic Media.
ACS Omega ( IF 3.7 ) Pub Date : 2019-05-23 , DOI: 10.1021/acsomega.9b01076
Bertrand Ngouné 1 , Martin Pengou 2 , Armel Megha Nouteza 1 , Charles Peguy Nanseu-Njiki 1 , Emmanuel Ngameni 1
ACS Omega ( IF 3.7 ) Pub Date : 2019-05-23 , DOI: 10.1021/acsomega.9b01076
Bertrand Ngouné 1 , Martin Pengou 2 , Armel Megha Nouteza 1 , Charles Peguy Nanseu-Njiki 1 , Emmanuel Ngameni 1
Affiliation
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Alkaloid extract from Rauvolfia macrophylla Stapf (AERMS) was studied as the corrosion inhibitor for C38 steel in 1 M HCl and 0.5 M H2SO4 using electrochemistry and surface analysis. The corrosion inhibition was efficient and proceeds via adsorption of AERMS on the steel surface due to the active functional groups present in the molecules. AERMS acts as a mixed inhibitor in HCl and as a cathodic inhibitor in H2SO4. In H2SO4 corrosive medium, the presence of iodides improves the adsorption of the alkaloid molecules by reducing the surface charge of the electrode and thus substantially decreases the corrosion rate. Two pure alkaloids (tetrahydroalastonine (THA) and perakine (PER)) were quantitatively isolated from AERMS, and their anticorrosive properties for C38 steel in 1 M HCl and 0.5 M H2SO4 were evaluated. THA showed the highest efficiency while the performance of PER was less important compared to the extract. This confirms that the efficiency of AERMS was the result of the complementary action of the chemical compounds present in the extract.
中文翻译：
大叶红景天生物碱提取物对C38钢在酸性介质中的缓蚀性能。
利用电化学和表面分析方法，研究了大叶红花生物碱（AERMS）的生物碱提取物作为C38钢在1 M HCl和0.5 M H2SO4中的腐蚀抑制剂。腐蚀抑制是有效的，并且由于分子中存在的活性官能团而通过AERMS在钢表面上的吸附而进行。AERMS在HCl中充当混合抑制剂，在H2SO4中充当阴极抑制剂。在H2SO4腐蚀性介质中，碘化物的存在通过减少电极的表面电荷来改善生物碱分子的吸附，从而大大降低腐蚀速率。从AERMS中定量分离出两种纯生物碱（四氢芦荟碱（THA）和过高硼烷（PER）），并评估了它们在1 M HCl和0.5 M H2SO4中对C38钢的防腐性能。与提取物相比，THA显示出最高的效率，而PER的性能则不那么重要。这证实了AERMS的效率是提取物中存在的化合物的互补作用的结果。
更新日期：2019-05-23
中文翻译：
大叶红景天生物碱提取物对C38钢在酸性介质中的缓蚀性能。
利用电化学和表面分析方法，研究了大叶红花生物碱（AERMS）的生物碱提取物作为C38钢在1 M HCl和0.5 M H2SO4中的腐蚀抑制剂。腐蚀抑制是有效的，并且由于分子中存在的活性官能团而通过AERMS在钢表面上的吸附而进行。AERMS在HCl中充当混合抑制剂，在H2SO4中充当阴极抑制剂。在H2SO4腐蚀性介质中，碘化物的存在通过减少电极的表面电荷来改善生物碱分子的吸附，从而大大降低腐蚀速率。从AERMS中定量分离出两种纯生物碱（四氢芦荟碱（THA）和过高硼烷（PER）），并评估了它们在1 M HCl和0.5 M H2SO4中对C38钢的防腐性能。与提取物相比，THA显示出最高的效率，而PER的性能则不那么重要。这证实了AERMS的效率是提取物中存在的化合物的互补作用的结果。
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