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The corrosion of pipelines continues to be a critical issue for the oil and gas sector, leading to significant financial setbacks and safety risks. In this study, the effectiveness of epoxy coatings incorporating 15 wt% benzotriazole-loaded halloysite nanotubes (BTA-HNT) and boiled linseed oil microcapsules (MCs) was explored for corrosion protection. The primary focus was to compare two distinct mixing techniques that are magnetic stirring and sonication, to assess their influence on the coating’s performance. Various characterization tools, such as FTIR, EDX, and particle size analysis, confirmed the encapsulation and even distribution of the microcapsules within the coatings. Electrochemical Impedance Spectroscopy (EIS) and scratch tests demonstrated that sonication-prepared coatings provided superior corrosion resistance and self-healing ability over time when compared to those mixed via magnetic stirring. Moreover, adhesion tests highlighted stronger bonding in the sonicated coatings, emphasizing the role of sonication in enhancing particle dispersion and overall coating performance. The findings illustrate the pivotal role of mixing techniques in maximizing the corrosion resistance and self-healing features of epoxy coatings, making them more effective for pipeline applications.