This is where formulation complexity increases. Protecting yellow metals is not simply a matter of adding “more” corrosion inhibitor but selecting the chemistries that are the most compatible with the entire additive package. Many corrosion inhibitors that perform well on ferrous metals can negatively interact with copper alloys, leading to long-term performance issues. At the same time, metal deactivators and yellow-metal-friendly inhibitors must remain stable in the presence of emulsifiers, dispersants, anti-wear additives, and base oils without sacrificing fluid stability or performance.
The expectation for lubricant manufacturers to deliver corrosion protection, wear resistance, oxidation stability, and extended service life calls for a balanced, multi-metal protection system. Effective yellow-metal protection is therefore not a standalone feature, but a formulation decision that directly impacts compatibility, performance validation, and real-world reliability. 
Manufacturers that address yellow metal sensitivity early in the formulation process are better positioned to avoid reformulation cycles, reduce testing failures, and deliver products that perform consistently in mixed-metal systems.

Partnering with Experts
Barentz understands that corrosion inhibitors are a vital part of any lubricant formulation. Smart selection of components will lead to strong performance, longer equipment life, and better end-user satisfaction. Our team of experts will be here to support you by helping you select not only the best corrosion inhibitor, but the best additive package for your formulation.