Citric acid, a weak acid that is present in many fruits naturally, including lemons and limes. Alternately, citric acid can be found in some products that are sold commercially. Weak acids act as a buffer in acid-base chemistry, reducing the effects of oxidation and reduction.

Citric acid, a small molecule tribasic acid, provides a number of defences. The protection is due to three locations on the citrate molecule that are easily able to interact with substances. Steel can be temporarily protected against corrosion by using Citric Acid Prevent Corrosion and is easily soluble in water.

How does it defend?

Even though stainless steel already has a protective layer of chromium oxide on its surface, citric acid protects steel by adding a second passivating layer to its surface.

The chemical process of passivation involves treating a material’s surface with another material (liquid, solid, or even gas). The formation of the layer causes potential corrosive substances to interact with it before they can do so with the steel beneath.

Before using a passivating coating, it is crucial to ensure sure the steel is free of impurities and oils. The passivating layer will not form entirely if this is done incorrectly. The steel below won’t be completely protected as a result. As a result, protecting your stainless steel naturally takes two processes.

By decreasing the citrate molecule on the surface of the steel, protection is obtained. Any free iron from the steel’s surface is removed during this process, leaving an inert oxide layer as protection. Corrosion is a result of iron oxidation.


Stainless steel is rust-resistant by definition. But in actual life, stainless steel’s resistance is usually compromised. With Reba Safer Chemical get answer of “How To Remove Rust From Stainless Steel.

A passivating layer is frequently helpful to boost the protective, naturally occurring layer of chromium oxide on the surface of the steel, providing an additional layer of protection.