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Product Information
Product Testing ReportNational Railway Product Quality Inspection and Testing Certification Center: Neutral Salt Spray Time 4000 Hours Report
Product Technical SolutionStar Metal Anti-corrosion Technology Solution
I. Technical Introduction
The workpiece is in a complex environment of high salt spray, high humidity, and tidal rise and fall, and the anti-corrosion protection design of high-strength fasteners faces huge challenges. According to national standards, the general anti-corrosion level should reach the standard of C5 or CX. According to the anti-corrosion standard, C5 requires a neutral salt spray ≥2000h, and CX requires a neutral salt spray ≥4000h. Traditional anti-corrosion treatment is generally 100μm hot-dip galvanizing for C5, and 120-150μm hot-dip galvanizing for CX. Currently, some units also use the solution of 304 stainless steel fasteners.
However, in actual use, hot-dip galvanizing has the following problems:
1. Due to the excessive thickness affecting the bonding strength with the substrate surface, it is easy to cause problems such as zinc shedding, and the anti-corrosion ability decreases instead.
2.