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How To Deal With The Rustic Spot Of Granite Of Villa Exterior Wall?
Nov 26, 2018

How to deal with the rustic spot of granite of villa exterior wall?

The exterior wall of the villa is granite fire plate, which has been used for more than 5 years.And the plate did not do any protective treatment after installation.After long-term exposure to the sun and rain, rust spots occur.


To treat a disease, the first thing is to understand the cause of the disease, and then you can do the right medicine. Generally, the cause of rust of stone is roughly as follows: iron element (Fe) and water (H20) and oxygen (O2) in the stone or environment are oxidized, so that rust spots are generated on the surface of the stone.

There are three types of rust spots:

(1) primary rust spots;

(2) secondary rust spots;

(3) Integral rust spots.


The principle of stone rust treatment:

(1) The ferric ion is reduced to a divalent iron ion by a chemical reducing agent, so that the yellow-brown water-insoluble ferric ion is converted into a colorless water-soluble divalent iron ion.

(2) Stabilized with a chemical stabilizer to prevent the ferrous ions from being reoxidized to ferric ions.

(3) Adsorption of residual divalent iron ions by a sticking method.

(4) The residual iron ions are removed by a plurality of "water spray-drying" processes.

The treatment process of stone rust spots:

1. Finished product protection: Use plastic film (or film) to cover and protect the construction area and surrounding items. Pay special attention to the treated syrup and cleaned sewage. It should not flow into the flowers and plants, otherwise it will cause environmental pollution. In addition, two or three buckets are prepared on site, and each bucket is filled with half a bucket of clean water for use.

2, cutting block: the main source of pollution caused by the disease is isolated from the stone, to prevent recurrence after treatment and treatment.

3, clean stone: dry cleaning method to clean the surface of the stone.

4. Unprotection: For the type of solvent of the stone protectant, select the corresponding chemical agent to remove the protective effect of the stone.

5, the right medicine: brush with a brush, hair, roller and other tools on the surface of the stone rust.

(1) Clean the rust spots with granitic rust remover (2-3 times).

(2) Wash the residue with a superoxide cleaning detergent (2-3 times).

(3) Wash the residue again with versatile stain remover (2-3 times) until the surface of the stone is clean.

(4) After each application of the medicine, cover it with a white cotton cloth or a non-woven fabric to moisturize (can not form a runny).

(5) Cover the plastic film and flatten it with a roller.

(6) After each application of the medicine, wait for 2 hours, open the corner to check the rust spots of the stone. If the rust spots are all removed, remove the cover and soak it in the bucket prepared beforehand; if the rust spots are not cleaned, repeat this Steps to "prescribe the right medicine" until the rust spots are completely cleaned.

6. Remove the liquid: Spray the water on the surface of the stone with a watering can to remove the remaining liquid. Repeat this step 3-4 times until the surface is neutral (tested with PH test paper). Then blow dry with a hair dryer.

7. Anti-oxidation treatment: Apply the antioxidant to the surface of the stone with a hair, and dry it, which can prevent the oxidation of iron.

8, protective treatment: brushing composite nano-silicone protective agent (or stone penetration protection agent), need to maintain health for 48 hours at room temperature, for every 10 °C temperature drop, the health time should be extended 2-4 times. This prevents water from penetrating into the stone, which again produces rust spots.

9. Clearing the field: Remove the finished product protection and properly handle the construction waste.

10. Notes:

(1) Do not work under natural conditions such as high temperature, direct sunlight, or rain.

(2) According to the site environment, segment protection, segment construction, and keep an eye on the weather.


Late preventive measures:

1. The stone is treated with protection every year to block the external pollution source from infiltrating into the stone.

2. Insulate the source of pollution and avoid direct contact between metal and stone.

3, the external wall cleaning should use the stone-specific cleaning agent, it is forbidden to use hydrochloric acid, sulfuric acid, nitric acid and other solutions to pickle.

4. When rust spots appear again, they should be treated with stone-specific chemicals in time to avoid the expansion of pollution and the increase of rust spots.