Comparison of NSS Corrosion Resistance Performance between Tangshan Yuantai Derun Galvanized Zinc-aluminum-magnesium Square Steel Tube and Traditional Galvanized Square Steel Tube

Artificial salt spray tests are widely used to determine the corrosion resistance of metal products. The most common type of salt spray test is the neutral salt spray test (NSS test), which uses a 5% sodium chloride solution with a pH range of 6-7 as the spray solution. The temperature is maintained at 35°C, and the salt fog deposition rate is between 1-2ml/80cm².h.

After undergoing 48 hours of NSS test (equivalent to 2 years in a natural environment), the new galvanized zinc-aluminum-magnesium square tube product from Tangshan Yuantai Derun Steel Pipe Co., Ltd. was given a surface rating of grade 8, with a defect area ratio of 0.15%~0.2%, and an appearance grade of B (almost no darkening caused by coverage layer corrosion). In contrast, the surface rating of the common galvanized square tube product was grade 1, with a defect area ratio of 35%~45%, and an appearance grade of I (cracked), with signs of base metal corrosion on the sample.

The comparative test shows that the new galvanized zinc-aluminum-magnesium square tube product from Tangshan Yuantai Derun Steel Pipe Co., Ltd. has far better environmental corrosion resistance performance than the common galvanized square tube product. This makes it an ideal choice for applications that require high corrosion resistance.

If you are interested in purchasing this product, visit our factory for consultation and orders. Our zinc-aluminum-magnesium steel pipe is currently selling at factory prices. Please email us at sales@ytdrgg.com for more information.