The basic definition of a rust inhibitor is a chemical compound that is added to fluid or gas to decrease the rate of corrosion of a metal or alloy.  There are several ways in which rust inhibitors function to decrease the rate of corrosion of a piece of machinery or equipment, and, depending on the type of metal, each rust inhibitor treatment is different. Important factors to consider when considering a rust inhibitor include the equipment’s composition material, its operation temperature, and the nature of the substance the rust inhibitor will be added to. When all these factors are taken into consideration, the most successful rust inhibitors can reduce the corrosion rate of a metal or alloy by 90-99%. 

There are several types of rust inhibitors, including anodic, cathodic, and mixed inhibitors. Each will work best with a specific type of metal or alloy. For example: 

Anodic Rust Inhibitors – This type of rust inhibitor is a “chromate” which forms an antirust layer on steel or aluminum surfaces to significantly lower corrosion. These types of anodic rust inhibitors have been shown to be carcinogens in humans, and their use is severely restricted.  It is best to consult with an expert before pursuing a chromate rust inhibitor solution. 

Cathodic Rust Inhibitors – These types of rust inhibitors retard corrosion. The most common type of cathodic rust inhibitors is zinc oxide, which slows the corrosion process by inhibiting the reduction of water to hydrogen gas.  

Mixed Rust Inhibitors – Mixed rust inhibitors use processes from both anodic and cathodic rust inhibition to protect surfaces from corrosions. The best example of this process is steam.  If used properly, steam passing through machinery such as boilers and drive turbines protects the pipes through which it passes. 

Rust inhibitors are commonly added to fuels, coolants, hydraulic fluids, boiler water, engine oil and any other industrial fluid that would benefit from a rust inhibitor treatment.  They can even be added as paints or glazes. Because of the considerations we have listed here, it is important to consult the experts before deciding on a rust inhibiting solution for your enterprise. At Total Lubrication, we understand that the loss of equipment, productivity and profit from corrosion is one of the major enemies of industry, and our experts are prepared to help you find the solutions that are just right for your enterprise.  Contact one of our representatives today to get started.