Influence of technical glycerine and composition on his base on 20 steel and aluminium corrosion durability in 0,1% NaCl https://doi.org/10.33108/visnyk_tntu2019.03.019
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Abstract
The sharp deterioration of the ecological state of the environment is associated not only with
the activities of various plants, but also with the lack of high-quality recycling of industrial waste and reliable,
safe anticorrosive protection of equipment. In this regard, over the past decade, increased attention has been paid
to the search for eco-friendly corrosion protection agents, in particular, through the use of waste from the
woodworking, food and other industries: extracts of wood chips, natural resins, and the breakdown products of
vegetable fats (technical glycerin). Therefore, the creation of so-called «Green» inhibitors is an urgent and
promising task.
Gravimetric and electrochemical studies, we found that technical glycerin (TG) has an anticorrosive
effect on steel and aluminium in a 0.1% NaCl solution. Its effectiveness in the concentration range of 1.0–2.5 g/l
is practically unchanged, the degree of protection Z is 57–67%. The inhibitory properties of TG due to its
adsorption on the surface of these metals with a predominance of the energy (double-layer) component of the
protective effect. The inhibitor retard both electrode reactions on steel 20 and aluminium, while reducing
corrosion currents by 2–4 times.
An increase in the anticorrosive properties of TG without an increase of its concentration is achieved
through the use of synergistic reagents. Triethanolamine in the composition with TG did not exert an inhibitory
effect, while the extract of oak chips (EO) with the ratio of TG: EO components = 3:l2 increased the degree of
protection of steel 20 and aluminium to 80–82%.
The protective mechanism of the created composition is somewhat different from the mechanism of the
main component. The compromise potential of both metals shifts to a more negative side, the nature of the cathode
and anode curves changes, in particular, the portion of the limiting diffusion current disappears. Corrosion
currents decrease by ~ 8 times.
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