scholarly journals Study on efficiency of corrosion inhibitors based on derivatives of isothiuronic salts

Author(s):  
I. A. Ushakov ◽  
V. S. Nikonova ◽  
I. V. Polynskii ◽  
L. G. Knyazeva ◽  
M. M. Polynskaya ◽  
...  

Metals play a pivotal role in industry; their use constantly grows. It is virtually impossible to find an industrial field without the use of metals and their alloys. However, owing to the quality degradation of metal during the operational process, corrosion appears not only on its surface but also under a coating, which leads to its destruction. To avoid this, corrosion inhibitors are necessary. Organic compounds have been widely used as corrosion inhibitors. Many organic corrosion inhibitors have been developed nowadays. In the literature, organic compounds comprising N, O, S and P heteroatoms are described, which reduce corrosion rate. The organic compounds are adsorbed on the metal surface, forming a thin layer. Adsorption occurs either through electrostatic interaction or, in some cases, the formation of covalent bonds. The work aimed to study isothiuronic salts as corrosion inhibitors to evaluate their protective properties using the polarisation curves method. Objects of research were isothiuronic compounds containing two active centres separated by saturated and unsaturated carbon bonds (structures 1-3). In structures 4-7, one isothiuronic fragment has different propylene substituting groups. It has been previously shown that these compounds can act as effective brightening agents when applying nickel coatings. A model solution with a density of 1.12 g/cm3 was prepared to study the corrosion inhibitors. The corrosion inhibitor concentration was 400 mg/L. Studies have shown that the compounds with two isothiuronic moieties do not always exhibit improved properties for inhibiting metal degradation in a corrosive environment. In particular, they showed worsening of the inhibiting properties for samples made of steel 20 and identical properties for that made of steel 3.

RSC Advances ◽  
2016 ◽  
Vol 6 (67) ◽  
pp. 62833-62857 ◽  
Author(s):  
Klodian Xhanari ◽  
Matjaž Finšgar

Corrosion inhibition of aluminium in acidic solutions using different organic compounds.


CORROSION ◽  
1980 ◽  
Vol 36 (4) ◽  
pp. 178-182 ◽  
Author(s):  
Y. SAITO ◽  
KEN NOBE

Abstract The rates of hydrogen penetration of annealed iron in different acids (pH 0.3), H2SO4, HCl, HClO4, and H3PO4, in the absence and presence of the organic compounds, benzotriazole, methylhydroxypentyne, and thiourea, have been measured. Although the differences in the hydrogen penetration rates of iron in the strong acids are not substantial, the penetration rate of iron in H3PO4 is significantly larger than that measured in the three strong acids. Both Benzotriazole (BTA) and methylhydroxypentyne (MHP) retard hydrogen penetration in all three strong acids. On the other hand, thiourea (TU) substantially accelerates penetration due to the presence of H2S. Anion effects on hydrogen penetration are small in the presence of BTA and MHP, while they are insignificant in the presence of TU.


RSC Advances ◽  
2017 ◽  
Vol 7 (46) ◽  
pp. 29042-29050 ◽  
Author(s):  
Lei Guo ◽  
Chengwei Qi ◽  
Xingwen Zheng ◽  
Renhui Zhang ◽  
Xun Shen ◽  
...  

Compared with the conventional DFT approach, SCC-DFTB method is more effective to deal with the adsorption issues of large size organic corrosion inhibitors on metal surface.


1970 ◽  
Vol 9 (5) ◽  
pp. 1071-1075 ◽  
Author(s):  
William E. Newton ◽  
Eugene G. Rochow

1998 ◽  
Vol 41 (3) ◽  
pp. 501-517 ◽  
Author(s):  
M. Bouayed ◽  
H. Rabaa ◽  
A. Srhiri ◽  
J.-Y. Saillard ◽  
A.Ben Bachir ◽  
...  

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