Tetrabutylphosphonium benzotriazolate is primarily used as a corrosion inhibitor in various industrial applications. It is particularly effective in protecting metals such as copper and its alloys from corrosion in environments where they are exposed to moisture, acids, or other corrosive agents. This compound is often incorporated into coatings, lubricants, and coolants to extend the lifespan of metal components in machinery, pipelines, and electronic devices. Additionally, it is utilized in the formulation of specialty chemicals for the electronics industry, where it helps prevent the degradation of copper circuits and connectors. Its thermal stability also makes it suitable for high-temperature applications, ensuring consistent performance under demanding conditions.