When people buy locks, they are generally worried that the locks will not be durable or they will rust when locks are not used for a long time. This question is related to the materials used and the finished of the locks.
From the point of durable, the best material should be stainless steel, especially for exterior materials. It has good strength, strong corrosion resistance and unchanged color. However, there are many kinds of stainless steel, which can be mainly divided into ferrite and austenite. Only austenitic stainless steel will not rust. The method of identification is very simple. It can be discerned with a magnet.
Copper is one of the most widely used materials of making locks. Its mechanical properties are good, corrosion resistance and processing performance are also well, and its color is gorgeous. It is strong and rust-proof, and can be used for plating 24K gold or placer gold and other external treatment, which is magnificent, dignified and generous.
Zinc alloy material, its strength and rust resistance is much worse, but its advantage is easy to make into complex parts, especially for pressure casting. The locks with complex patterns seen on the market have huge possibilities made of zinc alloys, which consumers should carefully identify.
Steel, with better strength and lower cost, but it is easy to rust. They are commonly used as internal structural materials of locks and are not suitable for external parts.
Aluminum or aluminium alloy (except for aerospace) is soft and light, material strength is lower, but it is easy to process.