In the machinery industry, the most used materials are carbon steel and alloy steel, and the parts made from them usually require anti-corrosion treatment. In addition to some conventional painting treatments, we actually have many surface treatment methods, such as electro-galvanizing, hot-dip galvanizing, sherardizing, phosphating, blackening, chrome-plating, cadmium-plating, nickel-plating, Dacromet and so on.
You may have heard of these methods, or even use them in practice. So what are their characteristics and how should they be used? Today we will use an article to introduce to you, remember to like and favorite!
First of all, let's look at blackening and phosphating with the worst anti-corrosion effect. Both of them have a characteristic, that is, the surface needs to be oiled after treatment. And this oil is also very important. Without oil, it will rust very quickly.
Blackening and phosphating are widely used due to their low price. Among them, the blackening neutral salt spray test can only reach 3 to 5 hours. The phosphating can reach 10-20 hours, if it is matched with advanced anti-rust oil, it can reach 72-96 hours. But the price of this oil is not cheap (2 to 3 times that of ordinary phosphating oil).
Then you may ask, what does the number of hours in this neutral salt spray test represent? We know that the salt spray test is an environmental test that uses the artificial simulated salt spray environmental conditions created by the salt spray test equipment to evaluate the corrosion resistance of products or metal materials. Compared with the natural environment, the salt concentration of chloride in the salt spray environment can be several times or dozens of times that of the general natural environment salt spray content, which greatly increases the corrosion rate. Also greatly sh
