When people buy door locks, locks generally are worried or not durable surface will not take long to rust or oxidation. This question is related to the problem of material and surface treatment used. From the perspective of durability, the best materials should be stainless steel, especially as a surface material, the more you use the more bright. Its strength, corrosion resistance, color change. But also has a variety of stainless steel, can be divided into ferrite and austenite. Ferritic stainless steel magnetic, commonly known as stainless iron, a long time will rust environment is not good, only austenitic stainless steel will not rust, differential solution is simple, with a magnet to discriminate a try. Copper is one of the most widely used material locks, good mechanical properties, corrosion resistance and processing properties are good, and the beautiful color, especially copper forged handle locks and other decorative pieces, smooth surface, good density, nonporous, trachoma. Both solid and rust, can be used for placer gold-plated 24K gold or other surface treatment, it is magnificent, noble and generous to people's home add a lot of color. Should consider before buying The consumer before the purchase locks should be the following considerations. (1) And the importance of workplace use. That is, considering the use of the street door, hall door, the room, bathroom or channel, in order to select products suitable for the intended function. (2) Use environment, conditions and requirements. You should consider the merits of using state of the environment, such as dry structure humidity, door thickness, door left or right to open the door, open the door or outside the door, to prevent buy the wrong products. (3) Consider coordination with the decoration environment. According to their preferences, purchase products should consider coordinating and supporting their room should be consistent. (4) Consider the situation of a family member Consider whether there are home for the elderly, children or people with disabilities, choose convenient for him (her) to use. (5) Consider affordability Combine family economic status, economic abundant can buy high-end products, the unsatisfactory economic selectable low-grade products, but pay attention to the choice of high-end or low-end products, manufacturers have to consider whether the strength of strong, quality is stable, We recommended to choose a considerable reputation enterprise products, to avoid losing money on daily life and to bring unnecessary trouble and distress. 6. Consider dealer reputation and service standards Prevent some dealers from their own interests, we recommend some fake and shoddy goods to consumers. How to choose the time of purchase Lock products in the purchase, should pay attention to the following (1) Should choose high-profile, quality and good after-sales service the company's products. (2) Check the identity of the purchased product packaging, signs are complete (including the implementation of standard products, grade, manufacturer name, address, date of production) packaging is solid, the content and product specification are consistent, beware of exaggerated and inconsistent with the facts phenomenon. (3) Observe the appearance of the product quality, including locks, lock, latch, handle and cover plate components and related accessories are complete, plating, painting surface color is bright, uniform, whether the rust, oxidation and signs of damage . (4) Check whether the use of functional, reliable, flexible, select two or more products should be checked against, especially when buying two-way lock products, you must use all the keys are internal, external lock switch trial. You should also check insurance agencies of particular products, it is recommended to lock each test at least three times or more. (5) Then check the key Tooth situations, such as spoons five teeth, each key should be not less than three different spoons teeth, while the first and fifth gear tooth should try not to choose the deepest spoon teeth, which will help plug key Stubbs and easily broken.