We all think that after the screw is galvanized, it will not rust, but this is not the case. After the screw is galvanized, it is not that it will not rust, but it will prolong the rusting time. Therefore, when the screw is in use, it is very important to have the requirements for its surface. Only the surface treatment that meets the environmental requirements can make the anti-rust performance of galvanized screws reach the best state. Of course, the anti-corrosion performance of galvanized screws is not the best among all surface treatment types. However, galvanized screws are the surface-treated fasteners with the largest market share. Compared with Dacromet treatment and hot-dip galvanized treatment, galvanized treatment abounds.
Before the production of galvanized screws, the relevant technical parameters have been clearly marked in the drawings, which include the drawing size of the wire, the size of the mold and the standard of the screw teeth, and even some rigidity of the screw during packaging. It is required that only when the standard is written, can it be implemented in place, otherwise it will not be standardized by just talking about it.
But why are the screws produced according to the standard requirements, but the galvanized screws are still found to be rusted? In fact, the galvanized surface treatment of screws is a very common process. If you want to have good anti-rust performance, galvanized is the worst. If the design allows, you can choose hot-dip galvanized or Dacromet treatment with longer anti-rust time. The galvanized screw is mainly for aesthetics and easy installation. Its anti-corrosion performance is only for indoor fixed environments, and it has a certain anti-rust performance. If you use a galvanized screw in a seaside environment, I am afraid it will not It's been rusty for a year.
So the reason why the galvanized screw rusts is not the reason of quality (of course we are referring to the harsh environment here, when the design of galvanized obviously does not meet these requirements, if it is in a normal environment, galvanized screws often appear rust, that is of course the reason for galvanizing), but to find out the problem from the root of the design, the design concept must meet the actual requirements.
If the screw is rusted before it is used, then we have to consider whether the screw itself has not been handled properly. Sometimes after we take the screws from the galvanizing factory to the warehouse, the temperature on the surface of the screws has not cooled down. If you seal it with a packaging bag at this time, the change in the temperature difference between the inside and the outside will cause a layer of fog to appear in the screw packaging. This fog Steam corrodes the surface of the screws very badly, and the screws will rust in a short time, so the time and process of packaging and storage are also very important.
The other is to save the environment. The storage environment of galvanized screws must have ventilation facilities, such as Wuxi, Jiangsu, which needs to be in the city from May to May, and the indoor air is very warm every day. If galvanized screws are stored in this environment, it is also It won't take long for it to rust.
The last reason for rust is the reason of the galvanized screw manufacturer. If the technology of the galvanized screw manufacturer is not good enough and the thread itself is flawed, it will of course rust.
