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Series of functionalized pyridinium alkyl[poly(oxyethylene)] phosphites, isoquinolinium alkyl[poly(oxyethylene)] phosphites, pyridinium aryl[poly(oxyethylene)] phosphites, and isoquinolinium aryl[poly(oxyethylene)] phosphites were obtained and their properties were studied systematically. Some of them were found to be effective corrosion inhibitors in aqueous CO2-and H2S-containing media. Isoquinolinium dodecyl-and dodecylphenyl[dodeca(oxyethylene)] phosphites proved to be the best inhibitors. The isoquinolinium aryl[poly(oxyethylene)] phosphites obtained were used to create a new corrosion inhibitor.

Protective effects of aryloxycarbonylmethylisoquinolinium chlorides on the iron surface were studied. The best results were obtained with decylphenoxycarbonylmethylisoquinolinium chloride (DPCMIQC) containing the alkyl C10 in the aryl fragment. This salt was used as an active component in an SNPKh-type corrosion inhibitor. Experimental data for this inhibitor were compared with the results obtained in bench and commercial field tests in West Siberia and the Ural-Volga region.

New ammonium compounds, namely, N-[isononylphenoxypoly(ethyleneoxy)carbonylmethyl]ammonium chlorides, were synthesized and found to be highly effective inhibitors of steel corrosion in aqueous hydrochloric media. The dependence of the inhibitive properties of the title compounds on their structure is discussed.

As found from polarization curves, in alkaline solutions, depending on the potential sweep rate, the action of brighteners based on a polymeric tetraalkylammonium salt (PTAS) can decrease or increase the hydrogen evolution overpotential. In the presence of Zn(II) complexes, the inhibiting action of PTAS on the cathodic hydrogen evolution increases. Some PTAS-based brighteners that ensure production of Zn–Ni alloy coatings uniform in thickness and composition from alkaline electrolytes are proposed. The degree of alloying of Zn–Ni coatings can be controlled by modifying the electrolyte with amino compounds.