Engine oils corrosivity

This handbook provides y oci with quick. ind, ii curate solutions to your everyday pipeline problems. With 100 more pages than the Setond Edilion, n saves you valuable time and elforl with useful tips on conversion tactors, construction and design, gas engineering, oil products, corrosion, economics and much more. 

Zinc dialkyl/diaryl dithiophosphates are widely used as antiwear additives in engine oils to protect heavily loaded engine parts from excessive wear. They are also used as antiwear agents in hydraulic fluids. The salts are effective oxidation and corrosion inhibitors, they also act as detergents. During friction, these salts form anion-radicals that are successfully cleaved (Kajdas et al. 1986). 

Functions of lubricant What is the distinctive role of engine oil in each of the following (a) friction, (b) durability, ( c) wear, (d) corrosion, (e) surface, (f) heat ... 

Wear metal analysis. ASTM D4951 and ASTM D5185 (ICP-AES). A wide variety of different metals occur in engine oil. The metal accumulation is a consequence of wear, corrosion, and from the air induction system. The wear metal values change with the maker and model of the equipment and with the type of service, including working environment, drain interval and filter change... 

High values of TAN and low values of TBN, compared to those of the fresh oil, indicate that the oil has lost some of its ability to neutralize acids. When the TBN is less than 2 (ASTM D2896), the oil reserve alkalinity is depleted when the TAN is greater than 7 (ASTM D664), the oil is acidic and may not adequately protect the engine from corrosion (Smolenski and Schwartz, 1994). 

Uses a 1978 General Motors eight-cylinder commercial engine (350 CID). This test evaluates an engine oil ability to resist rust and corrosion. 

Is an oil-soluble co-emulsifier often used as a corrosion inhibitor in two cycle engine oils. 

Ashless corrosion inhibitor for 2-cycle engine oils... 

Zinc dithiophosphates The dominating position of ZnDTPs as additives for lubricating oils is due to their multifunctional performance. Not only do they act as antioxidants, but they also improve the wear inhibition of the lubricant and protect metals against corrosion. ZnDTPs are mainly used to formulate anti-wear hydraulic fluids and engine oils. 

In addition to cleanliness, dispersants affect seal compatibility and copper/lead corrosion in engine oil formulations. 

A manufacturer s range of trunk piston engine oils will include products with base numbers from approximately 15 to 50. The appropriate oil is then selected to match the sulphur content of the fuel being used. In service, the initial BN will fall fairly rapidly but will then stabilise. The stabilised BN is normally rather more than half the original value of new oil, ensuring good corrosion protection. 

---