Artificial simulation salt spray test also includes neutral salt spray test, acetate spray test, copper salt accelerated acetate spray test, alternating salt spray test.

Neutral salt spray test (NSS test) is an accelerated corrosion test method that appears early and has wide application areas. It uses 5% sodium chloride brine solution, the solution PH value adjusted in the neutral range (6 ~ 7) as the solution for spraying. The test temperature is taken 35 ℃, the required settlement rate of salt spray in 1 ~ 2ml / 80cm².h between.

Neutral salt spray test 24h ⇌ Natural environment 1 year
After 48 hours of neutral salt spray test NSS (2 years in natural environment), the test sample:

Tangshan Yuantai Derun Steel Pipe Co., Ltd. new galvanized with zinc aluminum magnesium square tube product surface rating:8 grade: defective area of 0.15% to 0.2%, appearance grade B (almost no darkening due to corrosion of the cover layer), slight discoloration of the surface of the specimen;

General galvanized strip square pipe product surface rating: Grade 1: 35%~45% of defective area, appearance grade I (cracking), specimens show corrosion of base metal.

Tangshan Yuantai Derun Steel Pipe Manufacturing Ltd. new galvanized with zinc-aluminum-magnesium square tube products are far better than ordinary galvanized with square tube products in terms of environmental corrosion resistance after comparison tests.