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N-alkyl-2-(4-hydroxybut-2-ynyl) pyridinium bromides (designated as O-n) was synthesized and characterized by 1H and 13C NMR and FTIR. Box–Behnken design (BBD)-based optimization was engaged to analyze the factors and the interaction of the factors that influence the corrosion inhibition efficiency of O-n for X70 steel. The inhibition mechanism was also probed by means of X-ray photoelectron spectroscopy...