One. Can marble be cleaned with malic acid?
It is advisable to avoid directly using oxalic acid to clean marble stains, as oxalic acid oxidizes ferrous ions to ferric ions. The reduction of ferrous ions still results in high instability, which can react with air and water to cause further rusting. Furthermore, the movement of the oxalic acid solution can further expand the marble stains. This is why oxalic acid solutions are sometimes used to remove rust, as they can cover a larger area.
Two. How to repair marble damaged by hydrochloric acid.
1、To address the yellowing issue after using citric acid cleaning, a color-removing cleaning agent can be used. This cleaning agent is a water-soluble liquid specifically designed to remove pigments, stains, mold spots, and other blemishes from various substrates. It does not contain strong corrosive acidic substances and is easily washable, with a 90% biodegradability rate.
2. If the surface is cleaned with citric acid and then re-rusted, Super Rust Remover can be used for cleaning. Super Rust Remover is an alkaline rust remover that contains a small amount of phenol and reacts quickly with rust. It is particularly safe for marble and does not cause corrosion.
3. After cleaning the marble, a protective layer of marble sealant can be applied to prevent further contamination. However, cleaning only addresses the symptoms, not the root cause. To effectively address the contamination issue, either the source of the contamination needs to be eliminated or the opportunity for contaminants to enter the marble needs to be blocked.
Three. How to remove rust stains from marble
1、The main components of marble stone are calcium carbonate and alkaline substances. When using rust removers on marble, it is important to use acid-based rust removers to remove rust from the marble. Alkaline rust removers should not be used on marble.
2. When selecting a marble rust remover, it is crucial to choose high-quality products. These products, in addition to acidic components, contain appropriate additives to maintain the stability of iron ions. Rust stains treated with such removers can be preserved for a long time without recurrence, even without protective treatments. However, if the rust remover is simply a mixture of basic acidic liquids, it cannot maintain the stability of iron ions, making recurrence almost inevitable.
3. To treat marble rust spots, simply apply the rust remover to the stone surface. Deep rust removal methods are more complex and require specific rust removers and reaction times. Sometimes, multiple applications are necessary to achieve the desired results.
4、After removing rust from the stone, it should be cleaned again with water. If the stone dries, it should be treated with a suitable stone anti-penetration agent for protection. This is done to remove any remaining rust removal agents from the stone and prevent the formation of rust spots on the marble stone again.