The exterior wall of the villa is granite fire board, which has been used for more than 5 years. Moreover, the plate has not done any protective treatment after installation. After a long period of sun and rain, rust spots are produced.
Iron element (FE) in stone or environment reacts with water (H20) and oxygen (O2) to produce rust spots on stone surface
There are three kinds of rust spots
(1) Primary rust spot;
(2) Secondary rust spot;
(3) Integrated rust.
1. Finished product protection:
Use plastic film (or protective film) to cover and protect the construction area and surrounding articles, pay special attention to the treatment of liquid medicine, cleaning sewage can not flow into flowers and plants, otherwise it will cause environmental pollution.
In addition, two or three buckets shall be prepared on site, and each bucket shall be filled with half bucket of clear water for standby.
2. Cut off:
Isolate the main pollution source of the disease from the stone to prevent recurrence during and after treatment. (the main pollution source of this case is rainwater, so the construction should be carried out in sunny weather to avoid rainwater pollution.)
3. Clean stone:
Clean and dry the stone surface by dry cleaning.
According to the solvent type of stone protective agent, the corresponding chemical agent is selected to remove the protective effect of stone. (in this case, the stone has not been protected. If the stone has been protected, Dec 21 can be used to remove the protection of the stone surface, which is conducive to the penetration of the treatment agent.)