Prevention and treatment of chemical corrosion of marble

Prevention and treatment of chemical corrosion of marble

 1. The chemical corrosion of marble stone can be divided into two categories: man-made chemical corrosion and natural chemical corrosion:

(1) Man-made chemical corrosion is mainly caused by the following factors

1. The exhaust gas discharged from industry causes a sharp increase in the content of nitrogen oxides, hydrocarbons, sulfur oxides, carbon oxides and acidic granular substances in the air. When they are dissolved in rainwater, they will form acid liquid, which will affect the stone Cause corrosion.

2. Corrosion caused by acidic or alkaline "waste slag" and "waste liquid" discharged from industry eroding stone.

3. During the construction process, the chemicals used accidentally caused the corrosion of the stone.

4. Improper or excessive use of medicaments when cleaning stone or treating stone diseases, which will cause stone corrosion.

(2) Natural chemical corrosion is mainly caused by the following factors: 1. The N2, O2, and H2O in nature produce acid rain of HNO3 during discharge, which causes the corrosion of stone. 2. Nitric acid bacteria in nature can synthesize HN3 and O2 in the air into HNO3 acid solution under certain conditions to corrode stone.

2. Prevention and treatment of chemical corrosion

(1) Prevention of chemical corrosion 1. Strengthen environmental protection awareness, strictly control the high-standard discharge of industrial "three wastes", and carry out effective treatment to reduce the formation of acid rain. 2. During the construction process, the marble stone must be protected with high-quality marble stone curing agent. 3. When cleaning marble stone or dealing with marble stone disease, you must be cautious and "apply symptomatic medicine". If necessary, you should ask the technical staff of professional stone maintenance company for on-site guidance.

(2) Treatment of chemical corrosion The treatment of marble stone corrosion is mainly determined according to the specific conditions of marble stone facing: for smooth marble stone, the method of cleaning, grinding and polishing is generally used for treatment; for rough marble stone, it can be According to the different texture of the marble stone, it can be reworked by cleaning, repairing, or using fire, sandblasting, gouge and other techniques. After construction, be sure to use protective agent for protective treatment.