How to identify the quality of the hardware door lock material

If the door lock is made of zinc alloy, it typically has poor hardness and rust resistance. Even with thick plating, it can easily fade, turn black, or develop corrosion and blistering over time. However, one advantage of zinc alloy is its ability to produce complex shapes, especially through pressure casting. Many locks with intricate designs on the market are likely made from this material, so consumers should be cautious and check for quality before purchasing.

Steel offers good strength and is relatively inexpensive, but it is prone to rust. It is commonly used as internal structural components in locks rather than for external decorative parts, where durability and aesthetics matter more.

Aluminum or aluminum alloys are lightweight and easy to shape, making them ideal for certain applications. However, standard aluminum alloys (excluding those used in aerospace) tend to be softer and have lower mechanical strength compared to other materials. They are often used in parts that don’t require high load-bearing capacity.

Copper is one of the most widely used materials in lock manufacturing. It has excellent mechanical properties, good corrosion resistance, and is easy to process. Its natural color is attractive and can be enhanced through various surface treatments like gold plating. Copper locks, especially those with forged handles, usually have a smooth surface, high density, and no air bubbles or sand holes. This makes them both durable and resistant to rust, while also adding a sense of elegance and luxury to any home.

From a durability standpoint, stainless steel is considered the best option, especially when used as a surface material. It is highly resistant to corrosion, maintains its shine over time, and offers superior strength. There are different types of stainless steel, such as ferritic and austenitic. Ferritic stainless steel is magnetic and, although called "stainless," can still rust if exposed to harsh environments. The most reliable and high-quality type is 304 stainless steel, which provides excellent performance and long-term value for lock applications.

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