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What surface treatments are involved in the lock material

Update:2021-09-06
Abstract:

When people buy locks, they are generally worried that […]

When people buy locks, they are generally worried that the locks are not durable or the surface will rust or oxidize soon after use. This problem is related to the materials used and surface treatment.

From the standpoint of durability, the best material should be stainless steel, especially as a surface material, the more you use it, the brighter it will be. It has good strength, strong corrosion resistance and unchanged color. However, there are many types of stainless steel, mainly divided into ferrite and austenite. Ferritic stainless steel is magnetic, commonly known as stainless iron. It will rust after a long time and in a bad environment. Only austenitic stainless steel will not rust. The identification method is very simple. You can identify it with a magnet.

Copper is one of the most widely used lock materials. It has good mechanical properties, good corrosion resistance and processing properties, and has a bright color, especially the copper forged handles and other lock decoration parts. The surface is flat, dense, and has no pores. Trachoma. It is strong and rust-proof. It can be used to plate 24K gold or placer gold and other surface treatments. It looks magnificent, noble and generous, and adds a lot of color to people's homes.

Zinc alloy materials are much worse in strength and anti-rust ability, but its advantage is that it is easy to make parts with complex patterns, especially pressure casting. The locks with more complicated patterns seen in the market are likely to be made of zinc alloy, and consumers must carefully identify them.

Steel has good strength and low cost, but it is easy to rust. It is generally used as a material for the internal structure of locks and is not suitable for external decoration.

Aluminum or aluminum alloy, ordinary aluminum alloy (except for aerospace use) is soft and light, and the material strength is lower, but it is easy to process and shape.

Surface treatment generally refers to the use of metal electrodeposition (commonly known as electroplating), painting (called spraying), chemical oxidation (coloring) or other processing methods to cover or form a protective film on the surface of the part. The film mainly plays a role of anti-corrosion, while also increasing the appearance and durability of the product, which is an important factor to directly measure the quality of the product. Common methods for measuring surface treatment include: thickness measurement of the covering layer, adhesion inspection, salt spray and humidity test, appearance inspection, etc. For the coating, the adhesion, hardness, moisture test and appearance inspection of the coating film are carried out.

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