Polymeric Friction Modifier Corrosion Inhibition
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Solution Overview
Problem
Current crankcase lubricants face challenges with increased lead and copper corrosion when using ashless organic friction modifiers like glycerol monooleate in combination with dihydrocarbyl dithiophosphate metal salts, which can necessitate reduced additive treat rates or the inclusion of expensive anti-corrosion additives, impacting anti-wear and fuel economy performance.
Innovation Solution
Incorporating an oil-soluble or oil-dispersible polymeric friction modifier, specifically the reaction product of polyisobutylene succinic anhydrides, polyalkylene glycols, polyols, and unsaturated aliphatic monocarboxylic acids, in combination with dihydrocarbyl dithiophosphate metal salts, to reduce and inhibit corrosion of non-ferrous metal components in engine lubricating oil compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If ashless organic friction modifiers (e.g., GMO) are used to reduce friction and improve fuel economy, then fuel economy performance is improved, but lead and copper corrosion increases significantly
Solution Approach 1:
A polyol ester anti-corrosion additive is introduced as an intermediary substance between the ashless organic friction modifier and the non-ferrous metal components. This intermediary additive specifically targets and inhibits lead and copper corrosion while allowing the friction modifier to continue providing fuel economy benefits. The polyol ester acts as a protective mediator that prevents direct corrosive interaction between the friction modifier and metal surfaces.
Solution Approach 2:
The lubricant composition is formulated as a composite system combining multiple additives: ashless organic friction modifiers for fuel economy, dihydrocarbyl dithiophosphate metal salts for anti-wear protection, and polyol ester anti-corrosion additives for non-ferrous metal protection. This composite approach allows each component to address specific needs without compromising the others, achieving both fuel economy improvement and corrosion suppression simultaneously.
2Reliability
If dihydrocarbyl dithiophosphate metal salt anti-wear additives are used to protect metallic engine components, then anti-wear performance is improved, but lead corrosion increases
Solution Approach 1:
The polyol ester anti-corrosion additive serves as a protective intermediary that specifically targets lead and copper surfaces. It forms protective films on these non-ferrous metal components, preventing direct contact with corrosive substances generated by the anti-wear additive and friction modifier combination, thereby allowing full anti-wear performance without lead corrosion penalties.
Solution Approach 2:
The anti-corrosion protection is applied locally and selectively to non-ferrous metal components (lead and copper parts) rather than uniformly across all engine components. The polyol ester additive specifically targets these vulnerable areas, providing localized protection where it is most needed while maintaining overall lubricant performance.
3Object-affected harmful factors
If treat rates of anti-wear and friction modifier additives are reduced to decrease corrosion, then corrosion is reduced, but anti-wear and fuel economy performance deteriorate
Solution Approach 1:
The polyol ester anti-corrosion additive acts as a dedicated intermediary that handles the corrosion inhibition function separately. This allows the anti-wear and friction modifier additives to be used at optimal treat rates for their intended functions without needing to be reduced to mitigate corrosion, as the polyol ester specifically manages the corrosion protection aspect.
Solution Approach 2:
The polyol ester additive provides multi-functional protection by specifically targeting non-ferrous metal corrosion (lead and copper) while being compatible with both anti-wear and friction modifier additives. This universal anti-corrosion capability across different additive systems allows all components to function at full effectiveness without compromise.
Data Source
AI summary
The use of a polymeric friction modifier as an additive in an effective minor amount in a lubricating oil composition to reduce and/or inhibit the corrosion of the nonferrous metal containing engine components during operation of the engine.