4.3 Article

Didecyl dimethyl ammonium chloride as a highly efficient corrosion inhibitor for carbon steel in hydrochloric acid solution

Journal

ANTI-CORROSION METHODS AND MATERIALS
Volume 69, Issue 1, Pages 55-62

Publisher

EMERALD GROUP PUBLISHING LTD
DOI: 10.1108/ACMM-06-2021-2503

Keywords

Corrosion inhibitor; Hydrochloric acid corrosion; Carbon steel; Adsorption

Funding

  1. Sinopec key research and development project [320065]
  2. Scientific and Technological Innovation Team for the Safety of Petroleum Tubular Goods in Southwest Petroleum University [2018CXTD01]

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The study aims to find a highly efficient corrosion inhibitor for 45# steel in hydrochloric acid solution and elucidate the mechanism of inhibitors. Results show that didecyl dimethyl ammonium chloride (DDAC), especially in combination with dodecane phenol polyoxyethylene, can provide good protection for carbon steel in hydrochloric acid, with the N atoms and long alkyl chains in DDAC playing a vital role.
Purpose This paper aims to discover a highly efficient corrosion inhibitor for 45# steel in hydrochloric acid solution and reveal the mechanism of inhibitors. Design/methodology/approach In this paper, electrochemical measurements, weight loss measurements, surface characterization and theoretical calculation are used to evaluate the inhibition performance and reveal the mechanism of inhibitors. Findings Results show that didecyl dimethyl ammonium chloride (DDAC), especially in combination with dodecane phenol plyoxyethylene, could provide a good protection performance for the carbon steel in hydrochloric acid. The N atoms and long alkyl chains in DDAC molecular structure play the vital role. Originality/value Usually, DDAC is used as the compound chemical disinfectant in oilfield sterilization, medicine and health. However, to the best of the authors' knowledge, no study has shown that it can mitigate the corrosion of carbon steels in HCl solution.

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