Abstract
A novel corrosion and scale inhibitor (TPP) containing tobacco stem extract (TSE), polyepoxysuccinic acid (PESA), and polyaspartic acid (PASP) was obtained by the optimal proportion of the orthogonal test. The anticorrosion effect of TPP for carbon steel was researched by static weight-loss method, on-line simulated dynamic test, electrochemical measurement, and scanning electron microscopy (SEM). The results showed that TPP could protect carbon steel efficiently with a maximal corrosion inhibition rate of 85.7% and it was a mixed-type corrosion inhibitor, mainly exhibiting cathode suppression capacity. Simultaneously, the results of calcium carbonate deposition experiment indicated that the scale inhibition rate of TPP was up to 100%.
Highlights
Organic phosphorous compounds, such as 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP)and amino trimethylene phosphonic acid (ATMP), which possess the dual effects of scale inhibition and corrosion resistance, greatly promoted the development of water treatment technology [1,2,3,4]
The effects of tobacco stem extract (TSE), polyepoxysuccinic acid (PESA) and polyaspartic acid (PASP) concentrations on the protection ability of carbon steel were represented in the form of concentration vs. inhibition efficiency (Figure 2)
The improvement of the inhibition performance attributed to more coverage of the metal surface because of the adsorption of inhibitor molecules onto the carbon steel surface, which reduced the corrosion rate
Summary
Organic phosphorous compounds, such as 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP). PASP, as a multifunctional polymer material, which has replaced PAA and its copolymers in many fields, has gained widespread scholarly interest Another phosphorus-free and nitrogen-free inhibitor, PESA, exhibiting good synergistic effect, was suitable for high alkali and high hardness water systems, attributing to the stability of pentatomic chelates, which are formed by metal ions and oxygen atoms in polymer chains (Figure 1b). The chemical composition of TSE largely consists of reducing sugar (such as, glucose and fructose), organic acids (mainly malic acid, oxalic acid, and citric acid) and amino acid (for example, proline and asparagine) These chemical constituents would have anti-corrosion and scale inhibition effects due to their abundant functional groups, such as –COOH and –OH, and the oxygen atoms are regarded as effective adsorption centers [30]. The corrosion resistance behaviors of TPP for carbon steel were further researched by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS)
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