Because galvanized iron sheet is very easy to generate exothermic reaction under various natural environments, leading to erosion and corrosion. However, zinc does not change much in dry gas. In the wet and cold gas, the zinc surface will be transformed into a high-density basic zinc carbonate film. The key of stainless steel air duct is to coat zinc on the galvanized sheet of the ventilation air duct, which has maintenance effect on the galvanized sheet. The protective and decorative properties of zinc coating can be significantly improved after passivation, dyeing or coating with light protecting agent.

螺旋風(fēng)管具有以下特性：

Spiral duct has the following characteristics:

1、外觀光滑，無鋅瘤、毛刺，呈銀白色；

1. The appearance is smooth, free of zinc nodules and burrs, and silver white;

2、安裝方便，連接點少；

2. Easy installation and few connection points;

3、耐腐蝕性好，中性鹽霧試驗達(dá)240小時；

3. Good corrosion resistance, neutral salt spray test up to 240 hours;

4、采用熱鍍鋅方法完成，適用于各種強酸、堿霧氣等強腐蝕環(huán)境中；

4. It is completed by hot galvanizing method, and is suitable for various strong acid, alkali fog and other corrosive environments;

5、厚度均為可控，在5-107μm之內(nèi)任意選擇；

5. The thickness is controllable from 5-107 μ Any selection within m;

6、無氫脆、無溫度危害，可保證材料力學(xué)性能不變；

6. No hydrogen embrittlement and temperature hazard, which can ensure the mechanical properties of materials unchanged;

7、可代替部分需熱鍍鋅的工藝；

7. It can replace some processes requiring hot galvanizing;

8、通風(fēng)阻力小，通風(fēng)噪聲??；

8. Low ventilation resistance and noise;

9、強度與剛性均好；

9. Good strength and rigidity;

10、可根據(jù)客戶要求，專門設(shè)計、定做各種規(guī)格風(fēng)管；

10. According to customer requirements, we can specially design and customize various specifications of air ducts;