mild steel

It has been showed that food additives E451 and E459 inhibit corrosion in neutral water-salt medium and additives E316, E631, E621, E631+E551, herbs and spices increased it up to 1.75 times. Under microbial corrosion condition, inducted by sulfate-reducing bacteria, inhibition action (up to 80.9%) was discovered only for additive E459. Other studied additives increased microbial corrosion up to 2.27 times. The presence of food additives in corrosive medium influences the quantity of sulfate-reducing bacteria in biofilm on steel surface.

Aminooxoethylpyridinium chlorides under the St3ps steel corrosion in acid hydrochloric and sulfuric solutions demonstrate the inhibition efficiency at 98 %. The compound with hydrazinocarbonyl and 2,3- dimethylphenyl fragments turns out to be the most effective within the interval 293–333 К. This inhibitor is also characterized by a significant aftereffect due to the chemisorption on the steel surface.

Comparative assessment of corrosion stability of mild steels 3, 20 and 08KP in tap water was conducted. Similar corrosion behavior of these steels was shown by weight loss, linear polarization resistance and polarization curves techniques both for pretreated and corroded surfaces. The discrepancy of the results obtained with the LPR and weight loss techniques was found out and its possible reasons were discussed.

The activated carbon prepared from the bark of Ocimum Tenuiflorum reduces the amount of dissolved oxygen (DO) present in distilled water, which in turn reduces the rate of corrosion. The effects of DO, temperature and pH on the rate of mild steel corrosion were discussed. The inhibition efficiency of corrosion on mild steel was estimated by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The inhibition efficiency increases with increase in temperature, pH and the mass of activated carbon.

The Prosopis juliflora extract was investigated as a corrosion inhibitor for mild steel in 1M HCl using weight loss measurements, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The inhibition efficiency of Prosopis juliflora increases with an increase in inhibitor concentration and temperature. Polarization studies revealed that Prosopis juliflora acts as a mixed type inhibitor for mild steel in 1M HCl. AC impedance indicates that the value of charge transfer resistance increases with the increase in inhibitor concentration.