Corrosion inhibiting additive for rust prevention

May 04, 2018
Written by Staff
A good corrosion inhibiting additive can fundamentally boost the performance of grease used in equipment exposed to harsh conditions of humidity and salt spray. Developing an exceptional corrosion inhibiting grease for use even in harsh salt spray conditions is possible with Cortec’s new M-540 premium quality additive.
M-540 is formulated with proprietary technology to provide superior corrosion protection in bio-based and ester-based greases. It provides excellent long-term protection, even in humid and salt-containing environments, such as coastal and offshore conditions, where the chance for condensation and corrosion increases. 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.

Another important advantage of M-540 is that it not only provides corrosion protection to metals in direct contact with the grease; it also provides corrosion protection to nearby metals in bearing housings not directly touching the grease. Normally, to provide full protection to the cavity surrounding a gear or bearing, the space must be completely flooded with lubricant to allow the maximum level of surface contact possible with the corrosion inhibitor and minimize oxygen in the headspace. In contrast, M-540 contains Vapor phase Corrosion Inhibitors that vaporize 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 will be required for layup or intermittent use of equipment, yet void spaces where moisture might condense will also be protected.

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