galvanized pan head screws have so much to learn

Galvanized screws, which are familiar to the screw industry, are also commonly used because galvanized pan head screws are a type of screw fastener that is named after surface treatment. Although galvanized screws are common, they can be learned a lot. Let’s take a look at the professional galvanized screws.

1, electro-galvanized screws

Electro-galvanized screws are the most common surface treatment method and process technology in the manufacture of screw fastener products. The electro-galvanized layer is a typical anodized coating that is mainly used to enhance the substrate and also to improve the corrosion resistance of the substrate. Due to its thin coating thickness, it is also used for surface corrosion protection under general environmental conditions. The electroplating galvanized pan head screws surface treatment method and process technology have low cost, stable and reliable process, and convenient use. However, it is highly prone to hydrogen embrittlement, so dehydrogenation should be carried out in time after electroplating. In addition, the acid and alkali resistance is poor, the corrosion time is short, and the process of environmental protection is low.

2, powder galvanizing screws

The powder zinc infiltration screw is a surface treatment process in which a zinc immersion agent is used as a zinc source, and zinc is generated by heating, and iron atoms are mutually diffused to form a zinc immersion layer (zinc-iron alloy layer) on the surface of the steel. The main component of powder zinc infiltration is pure zinc powder, in which an appropriate amount of filler materials such as alumina, refractory earth, and ammonium chloride are added. The most prominent feature of powder zinc infiltration screws is not an external coating, but the base metal and the infiltration layer form an organic unity, so the combination is very strong. The hardness and corrosion resistance of the powder zincized layer is much better than that of the electro-galvanized layer. The most prominent feature of powder zinc infiltration is that the layer is uniform, there is no ammonia brittle, and there is almost no deformation. It is especially suitable for fasteners such as nuts, bolts, and other small hardware products, complex shapes and surface anti-corrosion treatment of powder metallurgy products.

3, mechanical galvanized pan head screws

The mechanical galvanized screw is a surface treatment process that uses an impact medium to impact the surface of the steel workpiece in the presence of zinc powder and a dispersant, a promoter, a liquid medium, etc., and then forms a galvanized layer on the surface of the workpiece. The mechanical galvanized layer is a completely different process from electro-galvanizing and hot-dip galvanizing. She forms an anti-corrosion coating. Its characteristics: production operation at room temperature, through the rotation of the plated part of the loading part, the impact medium in the cylinder rotates with the drum, and the parts collide with each other to generate mechanical impact force, and the zinc powder collides and deposits on the surface of the workpiece, thereby forming A coating having the basic physical characteristics of metallic zinc. The disadvantage is that the thickness of the zinc layer is uneven; the zinc layer is not as smooth and bright as the plating layer.

4, hot-dip galvanized pan head screws

Hot-dip galvanizing is also commonly referred to as hot-dip galvanizing. Hot-dip galvanizing is the process of pre-treatment of steel parts into molten zinc to form zinc and/or zinc-iron alloy coatings on the surface to obtain metal. The process and method of covering the layer. Hot-dip galvanizing applications are extremely extensive, such as hot dip galvanized highway traffic barriers (such as highway guardrail fasteners, fasteners, etc.. Hot-dip galvanized layer features good coverage and resistance to atmospheric corrosion. Better than electro galvanizing.

If you want to customized galvanized pan head screws please send an email: annie.li@szsst88.com