Rust converter phosphoric acid: All information

Rust converters are practically considered a panacea when it comes to fighting rust. The following article will tell you how they actually work, where their limits lie, and what role phosphoric acid plays in rust converters. What you should look for and what you can use as a replacement for rust converter from the store.

Effect of phosphoric acid

Virtually all commercially available rust converters work on the basis of phosphoric acid. It is the most effective rust converting agent currently known chemically.

The effect is based on the fact that phosphoric acid initiates a chemical process. In this process, the rust, which consists of iron oxides, is converted. At the end of the reaction, the existing iron oxide has become iron phosphate.

This compound is firm and stable and not porous like the rust. As a result, no moisture can penetrate, and the metal can no longer rust. The existing rust has been converted into a stable compound, thereby becoming inactive.

Impact restrictions on the use of phosphoric acid

The process is reliable with rust - but in chemical limits. Acid and rust must meet in a precisely defined ratio, so that in the end not rust remains, or excess acid is present. Both are problematic.

If there is still rust left over, the rusting process can continue to progress, and as a result, rusting through or further rust damage occurs.

If acid remains from the process, the priming and painting is often not clean. The wonder weapon rust converter works only within certain limits.

Alternative rust converter

Oxalic acid can not only be used for rust removal but also has certain rust inhibiting properties. The use of the gentle de-rusting agent can be favorable in many cases in advance.

Cola also contains phosphoric acid, but only in small amounts. The effect is the same as with rust converters from the trade. However, the reaction is slower and requires more cola due to its lower content. However, the function as a rust converter is completely given.

Discoloration by phosphoric acid

The inactivation of the rust does not turn the rust back into "real" metal, but into a dark gray layer of iron phosphate. That's what you should think about when you treat parts with rust converters that you do not paint later. The discoloration is permanent in this case.

Tips & Tricks

Rust remover alone is often not enough, especially for workpieces or parts where re-rusting is absolutely essential. In any case, thorough de-rusting should be used, such as with oxalic acid [/.

Video Board: Best way to stop, inhibit, convert and remove rust from metal using phosphoric acid