**First, the Material**
When purchasing locks, people often worry about their durability and whether the surface will rust or oxidize. This is closely related to the materials used and the surface treatment.
From a durability perspective, stainless steel is the best choice, especially for surface materials. The brighter the finish, the better. It offers excellent strength, corrosion resistance, and maintains its color over time. However, there are different types of stainless steel, mainly divided into ferritic and austenitic. Ferritic stainless steel is magnetic and commonly referred to as regular stainless steel. It can rust in poor environments over time. Only austenitic stainless steel is truly rust-resistant. To identify it, simply use a magnet — if it doesn’t stick, it’s likely austenitic.
Copper is also widely used in lock manufacturing. It has good mechanical properties, corrosion resistance, and ease of processing. Its appearance is elegant, especially in forged handles or other parts, where the surface is smooth, dense, and free of air bubbles or sand holes. It is both strong and resistant to rust, making it ideal for plating with 24K gold or other finishes, which adds a luxurious touch to any home.
Zinc alloy is another common material. While it has lower strength and rust resistance compared to others, it is easy to mold into complex shapes, making it popular for decorative locks with intricate designs. Consumers should be cautious when buying such products.
Steel is strong and cost-effective but prone to rust, so it's typically used for internal structural components rather than external decorative parts. Aluminum or aluminum alloys are lightweight and easy to shape, though they are generally softer and less durable than other metals.
**Second, Surface Treatment**
Surface treatment involves applying a protective layer to a part using methods like electroplating, painting, or chemical oxidation. These treatments not only protect the product from corrosion but also enhance its appearance and longevity. Common tests include measuring coating thickness, checking adhesion, performing salt spray and moisture tests, and conducting visual inspections. A well-treated surface ensures better quality and performance.
**Introduction of New Standards for Door Locks in China**
In June 2000, China released new national standards for door locks, replacing older versions that were no longer sufficient to meet modern market demands. With the country's entry into the WTO, it became essential to align with international standards and improve product quality. The revised standards, such as QB/T2473-2000, QB/T2475-2000, QB/T2474-2000, and QB/T2476-2000, are more rigorous than previous ones. They incorporate advanced foreign standards like ANSI, BS, and JIS, ensuring higher quality and safety.
The new standards classify external and spherical locks into two grades: A and B. Grade A meets British BS5872 standards, while Grade B is slightly lower but still superior to older Chinese standards. These improvements help China compete globally and reduce trade barriers.
**Things to Consider Before Purchasing**
1. **Location and Importance**: Determine where the lock will be used—front door, bedroom, bathroom, or hallway—and choose a product that suits the function.
2. **Environmental Conditions**: Consider humidity, door thickness, and whether it’s an inner or outer door to avoid mistakes.
3. **Decorative Coordination**: Select a lock that matches your interior design and personal style.
4. **Family Members**: If there are elderly, children, or disabled individuals, choose locks that are easy to use.
5. **Budget**: Choose a product that fits your financial situation, but always ensure the manufacturer is reliable and the quality is consistent.
6. **Dealer Reputation**: Be cautious of untrustworthy sellers who may offer counterfeit or low-quality products.
**How to Choose When Buying**
- Opt for reputable brands with stable quality and good after-sales service.
- Check the packaging, logo, and labels to ensure they match the product details.
- Inspect the appearance for scratches, rust, or uneven finishes.
- Test the lock’s functionality, including key insertion, turning, and security features.
- Ensure keys have multiple unique cuts for better security.
**Image:**
*Concerned about surprises*
**Tags:** Lock material and surface treatment
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