The lower concentration of Evapo-Rust® will take longer to remove the rust, but may have less of an effect on causing the carbon migration. Second, a further dilution of the Evapo-Rust® formula may have a positive affect. Once the rust has been removed, the parts should be rinsed and dried. First, high carbon parts should not be soaked longer than necessary. There are several things that can be tried to minimize the effects of carbon migration. A quick rinsing of the metal after Evapo-Rust® has been applied may also keep the carbon from settling into the pores of the metal. With Evapo-Rust®, sometimes a wiping with a dry cloth or a more rigorous buffing can remove the dark coloring. Unlike other treatments, Evapo-Rust® will not darken products made with low carbon steel. The primary difference between Evapo-Rust® and the acid based treatments is that Evapo-Rust® will not harm or weaken the metal.
Other rust removal treatments will also result in carbon migration and a darkening of the metal. Evapo-Rust®is not alone in creating the carbon migration effect.
Since Evapo-Rust® is a highly effective rust remover, it stimulates the carbon migration process. It merely represents the movement of carbon from the interior of the metal to the exterior of the metal. The darkening does not have an adverse affect on the metal. This heavier layer of carbon could cause a darkening of the metal due to the attributes of the carbon. The removal of the rust (iron oxide) reduces the proportion of iron to carbon, leaving a higher concentration of carbon on the outer surface. The carbon from the steel moves, or “migrates”, to the outer layer of the metal and settles into the pores. This is a natural phenomenon that chemists refer to as “carbon migration”. In certain instances, steel will darken in color after rust has been removed from the surface of the metal. Steel is composed of a combination of carbon and iron. We have experimented with applying Evapo-Rust in other ways, such as painting it on, but it simply does not work as effectively.The black film is carbon from the steel. This method is often employed for removing rust from the inside of tanks. If you are unable to completely immerse your part you may be able to remove the rust in sections, leaving the object partially immersed until the rust on that area is removed, then rotating it to immerse the next section. Witness the strength of CRC Evan RustEvapo-Rust® Super Safe Rust Remover will safely and easily remove rust from antiques, automotive parts, cast iron cookw. This far along in the process, the dark sediment created through chelation is visible at the bottom of the container. The small amounts of foam that form when pouring the Evapo-Rust obscured the metal pieces and made earlier photography difficult. The store will not work correctly in the case. It is interesting to note that the photo shown was taken near the end of the soaking period. View the range of CRC rust removal products and sprays - remove rust with ease from metal, steel and tools. Once your item is completely immersed, cover the container so that you do not lose the Evapo-Rust to evaporation. It is important that the metal is completely submerged in the Evapo-Rust. Put the rusty part in the container and pour in enough Evapo-Rust to cover it completely.
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