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News

What is the cause of rust spots on stone?

  • Author:Dora Zhang
  • Release on:2021-04-26
Rust spots are mainly formed by the oxidation reaction of iron in the stone.
Iron, water, and oxygen are the three major factors that contribute to the formation of rust spots.

First, we divide rust spots into two categories according to the different levels of reaction:

polishing pad




  • Deep Rust Spots





The Reason:
Many stone varieties, especially granite, contain a certain proportion of iron components. When these iron components are in full contact with water and oxygen, they will cause oxidation reactions and generate rust spots.

The alkali in the cement reacts with the iron in the stone under the action of water, and rust spots are also formed. 
Treatment: When dealing with surface rust spots, you only need to brush on the surface with rust remover, or you can use the method of surface grinding and polishing.
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  • Surface Rust Spots.





Reason: In the process of mining, processing, transportation and installation of stone, a small amount of iron residues are left after the surface comes into contact with iron objects. These iron residues will react with moisture and oxygen in the air to form rust spots. .

Treatment: The treatment of deep rust spots is relatively more complicated. It needs to maintain a certain dosage and reaction time, and sometimes requires a wet compress of the medicine to achieve better results.

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How to prevent it?

  • When choosing rust remover, be sure to choose good quality products

  • The treatment method of rust spots is mainly to use rust remover to deal with

  • When dealing with rust spots on the surface, just brush on the surface with a rust remover.

  • Due to the different material structure of marble and granite, the physical and chemical properties are also different.