The grease is applied to the metal surfaces directly and seals the surface from oxidation, preventing rust formation. The use of such a grease is ideally suited for use with installations subjected to extreme environments: marine vessels and agricultural machinery, vehicles, pipes, and construction tools. There are different types of greases. Most normal petroleum-based greases, besides causing harm to the environment because of the chemicals that are toxic or harmful to health and which get oxidized easily, have lanolin-based grease for corrosion protection, are a more ecologically sustainable option, have a very long shelf life, and perform quite effectively downstream.

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https://comunidad.espoesia.com/prolanprotective/what-is-a-corrosion-protection-grease-and-what-are-its-benefits/

Marine grease is one of the high-performance lubricants designed to withstand the corrosive marine environment. It is different from general-purpose greases because it is water-resistant and salt-resistant. Additionally, it is sometimes formulated with additives that impart anti-rust and anti-wear properties. Marine grease finds applications on the following around marine vessels: boat trailer couplings, winches, outboard motors, and steering mechanisms.

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https://prolanprotective.wixsite.com/prolan-benelux/post/what-are-the-key-features-to-look-for-in-marine-grease