A good corrosion inhibiting additive can boost the performance of grease used in equipment exposed to harsh conditions such as humidity and salt spray. While greases themselves provide a measure of corrosion protection, bearings and gears are more vulnerable to corrosion during periods of inactivity when the grease is not circulating. In this case, water condensation and puddling can initiate a corrosion site that may cause failure when equipment is restarted.

Cortec launches corrosion inhibiting additive for grease1Cortec’s new M-540 additive allows for the development of corrosion inhibiting grease for use even in harsh salt spray conditions. M-540 is formulated with proprietary technology to provide superior corrosion protection in bio-based and ester-based greases. It provides long-term protection, even in humid and salt-containing environments, such as coastal and offshore conditions, where there is a higher chance of condensation and corrosion.

When tested according to ASTM D5969 for rust prevention, grease that failed to prevent rust in a 5% seawater solution was able to pass the same test after M-540 was added. This seawater performance makes M-540 an ideal additive for formulating greases used in marine conditions such as those on offshore rigs.

Cortec launches corrosion inhibiting additive for grease2M-540 not only provides corrosion protection to metals in direct contact with the grease, but also provides corrosion protection to nearby metals in bearing housings not directly touching the grease. To provide full protection to the cavity surrounding a gear or bearing, the space is usually completely flooded with lubricant to allow the maximum level of surface contact possible with the corrosion inhibitor and minimise oxygen in the headspace. In contrast, M-540 contains Vapor phase Corrosion Inhibitors that vaporise and diffuse throughout the void space. These molecules form a protective layer on metals above the surface of the grease as well as those in direct contact with it.

Only a standard amount of grease containing M-540 is required for layup or intermittent use of equipment, and void spaces where moisture might condense are also protected. M-540 is easily diluted with a variety of bio-based or ester-based greases, and is compatible with copper. Dosage rates range from 2-10% depending on the level of corrosion protection desired. M-540 does not reduce the dropping point of the grease to which it is added.


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