目前支架主要的防腐蚀方式钢材采用热浸镀锌55-80μm，铝合金采用阳氧化5-10μm。

At present, the main anti-corrosion method for brackets is hot-dip galvanized steel 55-80 μ m. Aluminum alloy adopts anodizing 5-10 μ M.

铝合金在大气环境下，处于钝化区，其表面形成一层致密的氧化膜，阻碍了铝基体表面与周围大气相接触，故具有非常好的耐腐蚀性，且腐蚀速率随时间的延长而减小。

Aluminum alloy is in the passivation zone in atmospheric environment, and a dense oxide film is formed on its surface, which hinders the contact between the aluminum substrate surface and the surrounding atmosphere. Therefore, it has excellent corrosion resistance, and the corrosion rate decreases with time.

钢材在普通条件下，80μm镀锌厚度能保证使用20年以上，但在高湿度工业区或高盐度海滨甚至温带海水里则腐蚀速度快，镀锌量需要100μm，以上并且需要每年定期维护。

Steel under normal conditions, 80 μ The galvanized thickness can ensure a service life of more than 20 years, but in high humidity industrial areas, high salinity coastal areas, and even temperate seawater, the corrosion rate is fast, and the galvanized amount needs to be 100 μ m. The above and require regular maintenance every year.

在防腐蚀方面铝合金远远优异于钢材。

Aluminum alloy is far superior to steel in terms of corrosion resistance.

其他方面对比腐蚀方面

Compared to corrosion in other aspects

1）外观：

1) Appearance:

铝合金型材有很多种表面处理方式，如阳氧化、化学抛光、电泳涂漆等。外表美观并能适应各种强腐蚀作用的环境。

There are many surface treatment methods for aluminum alloy profiles, such as anodizing, chemical polishing, electrophoretic painting, etc. Beautiful appearance and able to adapt to various strong corrosive environments.

钢材则一般采用热浸镀锌、表面喷涂、油漆涂层等方式。外观差于铝合金型材。在防腐蚀方面也差于铝型材。

Steel is generally coated with hot-dip galvanizing, surface spraying, paint coating, and other methods. The appearance is inferior to aluminum alloy profiles. In terms of corrosion resistance, it is also inferior to aluminum profiles.

2）截面多样性

2) Cross section diversity

铝合金型材一般加工方式有挤压、铸造、折弯、冲压等方式。挤压生产是目前主流生产方式，通过开挤压模的方式，可以达到生产出任意任意截面型材，并且生产速度比较快。

The general processing methods for aluminum alloy profiles include extrusion, casting, bending, stamping, etc. Extrusion production is currently the mainstream production method. By opening extrusion molds, it is possible to produce profiles of any cross-section, and the production speed is relatively fast.

钢材则一般采用辊压、铸造、折弯、冲压等方式。目前辊压是生产冷弯型钢的主流生产方式。截面则需要通过辊压轮组来调节，但一般机器定型后只能生产同类产品，尺寸方面调节，而截面形状无法改变，如C型钢、Z型钢等截面。辊压生产方式则比较固定，生产速度比较快。

Steel is generally produced by rolling, casting, bending, stamping, and other methods. At present, roller pressing is the mainstream production method for producing cold-formed steel sections. The cross-section needs to be adjusted through a roller set, but generally machines can only produce similar products after shaping, and the size can be adjusted. The shape of the cross-section cannot be changed, such as C-shaped steel, Z-shaped steel, and other cross-sections. The roller pressing production method is relatively fixed and the production speed is relatively fast.

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