How to choose high-quality galvanized sheet
2022-12-12
Galvanized sheet is a raw material that is often used in the construction process. The quality of the material determines the quality of the building, so how can we choose high-quality galvanized sheet? When evaluating the quality of galvanized sheet, packaging, surface quality, galvanizing The amount, chemical composition, shape and so on will be added to the consideration.
Packaging: The packaging of galvanized sheet is divided into two types: one is galvanized sheet cut into a fixed length and the other is the packaging of galvanized sheet with coils. Generally speaking, iron sheet is used as the outer packaging and lined with moisture-proof paper, and there is an iron waist on the outside to tie it around. This can make the packaging of galvanized sheet more firm and prevent them from rubbing against each other in the packaging.
Surface: There are different coating and plating methods for galvanized sheets in actual production, so the surface conditions are also different, including ordinary zinc flowers, fine zinc flowers, no zinc flowers, flat zinc flowers, etc. Generally speaking, there should be no defects that will affect the use of galvanized sheets with qualified quality. For example, the following are listed.
Galvanizing amount: This is also an important standard for examining galvanized sheets. The galvanizing amount often reflects the thickness of the zinc layer of the galvanized sheet. Galvanized sheets are divided into two types: equal thickness galvanizing and differential thickness galvanizing. The galvanizing amount on both sides of the galvanized sheet is the same in the former, and the galvanizing amount on both sides of the galvanized sheet is different in the latter. Generally, the unit used when examining the galvanizing amount is g/m2.
Machine function: Generally speaking, there are two kinds of function tests that galvanized sheets need to undergo, one is tensile test and the other is bending test. For example, the standards of bending test are different in different countries, but generally speaking, qualified galvanized sheets should be bent 180 degrees, and the outer zinc layer will not crack the plate base and should not crack or break.
The service life of galvanized sheet is very long. The main reason is that its own corrosion resistance has been greatly improved. When used in the same humid environment, compared with aluminized zinc plate, aluminum plate and other products, it shows oxidation and corrosion. The degree is very slow. Many people have also put forward such a question, that is, whether this galvanized sheet is easily corroded after cutting, the section will be easily corroded. In order to answer this question, experts have also done an experiment, which has proved that even after cutting The corrosion resistance of the section is still very good.
The processing technology of galvanized sheet is also very similar to that of various metal coating processes. It adopts the continuous melt coating process. In recent years, the automobile industry has paid great attention to it, and has begun to use this product widely. It has become an automobile. The main body of the thin plate, the manufacturer is also studying and expanding its types and specifications in order to better meet the needs of the automobile industry, hoping to greatly improve its corrosion resistance, weldability and pulverization peeling resistance.
In addition to the automotive industry, it can also be used in storage boxes and the construction industry. It has become an important choice of anti-corrosion materials on the market. It also has a protective film during processing. Even if the surface is damaged, it can still Maintain a very long-term anti-corrosion effect and greatly increase its service life.
Many people feel very unfamiliar when they mention galvanized sheet. In fact, it is widely used in our daily life. For example, we can see it in the cabinets, tables and bookshelves we use. It can also be used in our house decoration. For example, in the use of roofs, balconies or pipes, many electrical appliances used in the home will also use this galvanized sheet material, which also shows that it has a wide range of applications, but everyone needs to choose this product according to their own needs. Purchase, because it will have some differences in different fields of application. Reasonable selection can give full play to its excellent performance.
Due to the different treatment methods in the coating process, the surface condition of galvanized sheet is also different, such as ordinary zinc flower, fine zinc flower, flat zinc flower, no zinc flower and phosphating treated surface. Galvanized sheet should have a good appearance and must not have defects that are harmful to the use of the product, such as no plating, holes, cracks and dross, exceeding plating thickness, scratches, chromic acid dirt, white rust, etc. Foreign standards are not very clear about specific appearance defects. Some specific defects should be listed on the contract when ordering.
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