Corrosion of steel or iron doesn't just happen "out of the blue". Rust causes damage to untold numbers of machine components not only through direct electrochemical erosion of the metal but through incidental increase in pitting and wear caused by the iron oxide particles. This can be of special significance in mining operations where the potential for exposure to wet or humid environments is extremely high. While grease itself can inhibit some corrosion by reducing ingress of moisture, the addition of rust or corrosion inhibitors is often needed to give additional protection. There is a wide variety of additive solutions as well as a number of different corrosion tests to screen their effectiveness. An overview of some common corrosion tests along with studies comparing the severity of the tests with various aqueous solutions and under different test conditions will be presented.
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