Does Rust Converter Actually Convert Iron Oxide into Something Else?

When it comes to dealing with rust, one of the most common solutions that comes to mind is the use of rust converters. These products, often found in home improvement stores like Home Depot and Lowes, are designed to halt the rusting process and prepare the surface for painting. But does a rust converter actually convert iron oxide, or rust, into something else? Or is there still rust underneath once it dries? Let’s delve into the science behind rust converters to answer these questions.

What is a Rust Converter?

A rust converter is a solution that is designed to stop the rusting process on a metal surface. It is typically a water-based primer that contains two key ingredients: tannic acid and an organic polymer. The rust converter works by reacting with the rust (iron oxide) on the surface of the metal, converting it into a stable, black protective polymeric coating that serves as an excellent base for paint.

How Does a Rust Converter Work?

The rust conversion process begins when the tannic acid in the rust converter reacts with the iron oxide (rust). This reaction forms a stable and insoluble blue-black compound known as ferric tannate. The organic polymer then provides a protective coating that seals the surface from moisture, preventing further rusting. The resulting surface is not only protected from further rusting, but it is also primed and ready for painting.

Is There Still Rust Underneath?

Once the rust converter has dried, there is no longer any rust on the surface of the metal. The iron oxide has been chemically converted into ferric tannate, a stable and protective compound. This means that the rust has not simply been covered up or sealed away; it has been transformed into a different compound that will not continue to rust. However, it’s important to note that rust converters can only react with the rust that is present on the surface of the metal. If there is rust inside the metal that the converter cannot reach, that rust will continue to spread.

Conclusion

In conclusion, rust converters do indeed convert iron oxide into a different compound, ferric tannate. This process not only halts the rusting process but also provides a protective coating that prevents further rusting and prepares the surface for painting. However, rust converters can only treat the rust that they can reach. If there is rust inside the metal, it will continue to spread, and further treatment may be necessary.