Development and Comprehensive Study of a Novel BNP Inhibitor for Corrosion Protection of D16T Aluminum Alloy in Model Formation Water

This study presents the development and evaluation of a novel ternary BNP corrosion inhibitor composed of boric acid (B-component), 1,4-phenylenediamine (N-component), and disodium hydrogen orthophosphate (P-component) for the protection of D16T aluminum alloy in model formation water.The inhibition performance was evaluated using gravimetric, electrochemical, and surface wettability techniques.The optimized BNP composition achieved a protection efficiency of 93.13 % at 31.2 mg dm -3 and significantly reduced the corrosion current density from 6.4110 -6 to 2.1610 -6 A cm -2 .The inhibitor decreased the apparent activation energy and increased surface hydrophobicity, indicating the formation of a protective surface layer.Inhibitor adsorption obeyed the Langmuir and Freundlich isotherms, indicating additional heterogeneous surface interactions, and was characterized as spontaneous and endothermic.Electrochemical results suggested mixed-type inhibition mechanism.The results indicate that cooperative interactions between the B-, N-, and P-components promoted the formation of a stable protective layer, highlighting the potential of multicomponent inhibitor systems for corrosion protection of aluminum alloys in aggressive oilfield environments.