Palumbo Gaetano, Berent Katarzyna, Proniewicz Edyta, Banaś Jacek
Faculty of Foundry Engineering, AGH University of Science and Technology, Reymonta St. 23, 30-059 Krakow, Poland.
Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Mickiewicza St. 30, 30-049 Kraków, Poland.
Materials (Basel). 2019 Aug 16;12(16):2620. doi: 10.3390/ma12162620.
Guar gum (GG) was investigated as a possible eco-friendly corrosion inhibitor for pure aluminium in a 1-M HCl solution at different temperatures and immersion times using gravimetric and electrochemical techniques. The results showed that GG was a good corrosion inhibitor for pure aluminium in the studied environment. The inhibition efficiency of GG increased with increasing inhibitor concentration and immersion time but decreased with increasing temperature. Polarisation measurements revealed that GG was a mixed type inhibitor with a higher influence on the cathodic reaction. The adsorption behaviour of the investigated inhibitor was found to obey the Temkin adsorption isotherm and the calculated values of the standard free adsorption energy indicate mixed-type adsorption, with the physical adsorption being more dominant. The associated activation energy () and the heat of adsorption () supported the physical adsorption nature of the inhibitor. Fourier-transform infrared spectroscopy (FTIR) and Raman/SERS were used to explain the adsorption interaction between the inhibitor with the surface of the metal. The results suggested that most inhibition action of GG is due to its adsorption of the metal surface via H-bond formation.
采用重量法和电化学技术，研究了瓜尔胶（GG）在不同温度和浸泡时间下，作为1-M盐酸溶液中纯铝的一种可能的环保型缓蚀剂的性能。结果表明，在研究环境中，GG是纯铝的良好缓蚀剂。GG的缓蚀效率随缓蚀剂浓度和浸泡时间的增加而提高，但随温度的升高而降低。极化测量表明，GG是一种混合型缓蚀剂，对阴极反应有较大影响。研究发现，所研究缓蚀剂的吸附行为符合Temkin吸附等温线，计算得到的标准自由吸附能值表明为混合型吸附，其中物理吸附占主导地位。相关的活化能（）和吸附热（）支持了缓蚀剂的物理吸附性质。利用傅里叶变换红外光谱（FTIR）和拉曼/表面增强拉曼光谱（Raman/SERS）来解释缓蚀剂与金属表面之间的吸附相互作用。结果表明，GG的大部分缓蚀作用是由于其通过氢键形成吸附在金属表面。
