Views:481 Author:Site Editor Publish Time: 2021-09-13 Origin:Site
First of all, we need to understand why fasteners are corroded because most of the fasteners are made of metal and metal has its electric potential. When two metals meet, they will have an effect, resulting in a galvanic battery. At that time, current flows between the two metals, so that the metal with a higher potential degrades faster than the metal with a lower potential. Zinc, galvanized steel, and magnesium are metals with higher potentials, while silver, copper silver alloy, gold, zirconium, platinum, and titanium are metals with lower potentials.
Generally speaking, the types of fasteners that will corrode include galvanic corrosion, uniform corrosion, crevice corrosion, and intergranular corrosion.
So, what are the methods to prevent fasteners from corrosion and rust?
Stainless steel screws are made of metal, and there are four main methods for metal corrosion protection, namely the nature of the material itself, the environment in which it is used, the interface between the material and the environment, and the design of improving the metal structure. If a complete corrosion-resistant alloy is used to manufacture stainless steel screws. Unless there is a special need, it is impractical in terms of economic concept, or the appearance of the screw is completely isolated from the environmental elements that will cause corrosion, which may not be feasible in practice, and it may be very difficult. Improving the design of metal structures can improve the impact of special circumstances under certain conditions, and its maintenance function is not permanent. Therefore, this method cannot deal with the problem, as long as the interface is Anti-corrosion, that is, surface anti-corrosion treatment is currently the most widely used method. The anti-corrosion treatment of stainless steel screw surface refers to the use of various methods to apply a maintenance layer on the surface of the metal. Its function is to isolate the metal from the corrosive environment, to prevent the corrosion process, or reduce the contact between the corrosive medium and the metal surface. The purpose of avoiding or mitigating corrosion.
The maintenance layer is usually divided into two types: metal coating and non-metal coating. Metal coating refers to the use of a metal or alloy with strong corrosion resistance to form a maintenance layer on the surface of the easily corroded metal. Such as copper clad silver strips, silver clad strips, silver clad copper strips, silver contact rivets, and silver copper clad metal strip. This kind of coating is also called plating. There are many methods and varieties of metal coatings, the most common of which is electroplating, followed by molten metal immersion plating (hot-dip plating) and chemical surface treatment. Non-metallic coating refers to the use of organic polymer materials such as paint and inorganic materials such as alloy of copper and silver semiconductors ceramic to form a maintenance layer on the surface of metal equipment or parts. This maintenance layer can completely isolate the base metal from the environmental medium and avoid the base metal from contact corrosion.
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