The Thickness of Epoxy Paint and Anti Corrosion Paint on Asbestos Plate Surface

Characteristics and Applications of Asbestos Materials

The porosity and fibrous structure of asbestos materials can form a waterproof layer, effectively preventing water penetration. High temperature resistance, corrosion resistance, wear resistance, low density, high elasticity, and low thermal conductivity, suitable for various environmental conditions. The anti-corrosion surface treatment extends the service life and improves the safety performance. Fiberless cement asbestos board is a green environmental protection material with the advantages of water resistance, fire resistance, crack resistance, and corrosion resistance, so it has a wide application prospect in the construction industry, water conservancy engineering and other fields.

Performance and Application

1. Main Properties of High Solid Epoxy Paint

Epoxy paint is composed of epoxy resin, body pigment and curing agent. It can be widely used on the surfaces of various light metal and cement structures indoors and outdoors.

Materials are painted with special high solid epoxy primer to improve adhesion. Its good anti-corrosion and water resistance, suitable for waterlogged areas. Good drying and curing properties make it particularly suitable for water conservancy construction materials.

2. Polymer Anti-Corrosion Topcoat

The topcoat requires good corrosion resistance. Polymer anti-corrosion paint has good acid, alkali and salt corrosion resistance, and excellent water, oil and weather resistance. Widely used in the painting of environmental protection equipment, sewage treatment engineering and other underground or ground anti-corrosion projects of steel structures and concrete structures.

3. Application of Asbestos Board

Sample

We received samples from the water industry. The customer need to measure the thickness of the two layers separately.

Base Material: Fiberless cement asbestos board, formed by scraping method, with two layers coating.

First Layer: High Solid Epoxy Paint

Second Layer: Polymer Anti-Corrosion Topcoat

The quality and thickness of the primer and topcoat are very important to the performance of asbestos board, which is related to the service life of the asbestos board. Too thin coating is more likely to be damaged than a thick one, because it’s easy to have leaks, water and oxygen can easily and faster penetrate the thin layer. For harsh use environments, it is necessary to increase the coating thickness appropriately, but too thick coating may sometimes cause wrinkles. This will result in poor adhesion of the coating to the substrate and easy to fall off. To prevent wrinkling, the coating process should be standardized and the thickness of each layer coating should be controlled.

Measurement Analysis

Portable ultrasonic thickness gauge using ultrasonic principle make convenient and fast measurement . The coating thickness can be detected anytime, the measurement results can be stored for analysis.

We use YUSHI PM5 Gen2 ultrasonic thickness gauge to visually and accurately determine the echo condition through real-time A-scan waveforms. Matching a 15-20M single crystal delay line probe, the ultrasonic wave enters the coating through the couplant and reflects on surfaces with different densities. The coating thickness reading is obtained by measuring the time it takes for the ultrasonic signal to travel from the probe to the coating-coating/coating-substrate interface and back. The time is divided by 2 and multiplied by the sound velocity of the coating to obtain the thickness of the coating.

Measuring Results

After testing, using YUSHI PM5 Gen2 ultrasonic thickness gauge with a 15M delay line probe, the measured value is stable, the echo is clear, and the result is accurate.

As a waterproof and anti-corrosion material, the protective layer primer and topcoat of fiber-free cement asbestos board play an important role. If you want to learn about the method of using ultrasonic technology to measure the thickness of multiple layers simultaneously, or any problems in measurement applications, please feel free to contact us and we will provide you with solutions.