How to identify unqualified weathering boards
With the development of manufacturing industry, the application of weather-resistant boards is becoming more and more widespread. Weather-resistant boards can be used in many industries such as agricultural machinery, equipment, furniture and vehicles. They have the advantages of corrosion resistance, tensile resistance, high strength and low cost. However, weather-resistant boards also have their own quality problems. What kind of weather-resistant boards are unqualified? Today, let the editor introduce to you how to identify unqualified weathering boards.
1. Observe the mechanical structure of the weather-resistant board
Due to mechanical and technical quality problems, unqualified weather-resistant boards will cause pits, scratches, scratches and other impurities on the surface of the product. The surface of qualified weather-resistant boards requires no surface defects, stains, exposed iron powder, etc.
2. Look at the true color of the metal
The true metal color of the weather-resistant plate is chromium-nickel, zinc plating and other alloys. If you want to identify unqualified weather-resistant boards, you can use a hammer or cold steel knife to draw a line on the weather-resistant board. If it is Inconel, the surface can be black-gray without wear; galvanized weather-resistant boards have a layer of white zinc powder on the surface. , after painting on the weathering board, you can see the obvious phenomenon.
3. Check the tensile strength of the weather-resistant board
Strictly follow the instructions of QL-003-1996 and GB/T, 92-12-1988, use electronic tensile tester or pressure test The machine performs a tensile test on the weather-resistant board. If the weather-resistant board is unqualified, its tensile force value does not meet the standard requirements, and creases and elastic plastic phenomena will appear when stretched.
4. Discuss the corrosion resistance of weather-resistant boards
To know the corrosion resistance of weather-resistant boards, you need to conduct chemical tests. Place the weather-resistant boards in reagents with different pH values of 5% or In 10% HCL, dilute sulfuric acid or hydrochloric acid, check whether there is any corrosion on the surface of the weathering board after the test. If it is an unqualified weather-resistant board, there will be obvious corrosion, discoloration and spots on the surface.
In summary, to identify the quality of weather-resistant boards, you must not only check its mechanical structure, but also check its metal color, tensile strength, corrosion resistance and other parameters, in order to accurately identify weather-resistant boards. Whether the board is qualified or not. Therefore, when purchasing weather-resistant boards, you should carefully check their quality to ensure that they are of qualified quality.