Bio-Based Alternative to Traditional Rust Preventive Oils

Photo Credit: Cortec

EcoLine 3690 from Cortec is a canola-oil-based rust preventive for long-term protection of metal components. It leaves behind a thin oily film that clings to metal surfaces and protects in severe conditions, such as high humidity and marine environments. The product contains 72% USDA certified bio-based content, replacing a large portion of the nonrenewable content present in traditional oil-based rust preventives.

As a wet-film corrosion inhibitor, EcoLine 3690 is suitable for users who like the properties and performance of VpCI-369 but are looking to try a greener option that is friendlier to workers and the environment. EcoLine 3690 is considered zero volatile organic compounds (VOC) and has no hazard statements. It can be applied via spray, dip or brush. When the protection period is done, it is easy to remove with an alkaline cleaner, such as those in the VpCI-41x series.

This rust preventive can be used in almost any application where VpCI-369 is typically used. This includes automotive service parts, piping, tanks for air brake systems, moving parts on large equipment and more. While the product is primarily used for rust prevention during extended storage, it can also be used to provide protection in-process, in transit or as part of a full-scale site mothballing plan.

In 2019, EcoLine 3690 was used by a company that needed to prepare automotive service parts for up to 10 years of storage. Two camshafts and one cylinder head were coated by hand with the product and subjected to corrosion testing. It met requirements and was subsequently written into the automaker’s aftermarket engineering specifications. The company applying EcoLine 3690 was happy with the product and its environmental and worker benefits in contrast to the previous rust preventive, which had been used for decades and was not only difficult to remove but also raised environmental and safety concerns.

In another case, a manufacturer of tubes for fire protection systems selected EcoLine 3690 for use on the ends of 30-foot (9-m) pipes. These ends were missed during the fast-paced painting process and required supplementary protection during 9-12 months of outdoor storage. The manufacturer did a trial on a small test bundle stored outside for about eight months, was impressed with the results and subsequently adopted it for use. 

While the product is not ideal for every application, many users will find it a good alternative to traditional oily rust preventives, the company says.