Supply from nearby steel formwork manufacturers: How to extend the service life of formwork in highly corrosive environments?

1、 Upgrade of corrosion-resistant materials
Preferred stainless steel material
Conventional corrosion environment (pH 6-9): Select 304 stainless steel (Cr18% - Ni8%), with a chloride ion corrosion resistance threshold of 200ppm
Severe corrosive environment (Cl ⁻>500ppm): Upgraded to 316L stainless steel (containing Mo 2% -3%), with a pitting corrosion resistance equivalent PREN ≥ 35
Composite structure optimization
Adopting a composite structure of 5mm stainless steel panel and Q345B carbon steel skeleton, the cost is reduced by 40% compared to all stainless steel, and the anti-corrosion performance is equivalent to pure stainless steel
Core load-bearing components coated with nickel based alloy layer (such as Inconel 625), with temperature resistance increased to 650 ℃
2、 Innovation in surface treatment technology
Applicable scenarios for improving the performance of processing technology
Nano ceramic coating improves wear resistance by 3 times and extends acid corrosion resistance life by 5 times for chemical reaction kettle molds
Laser cladding technology achieves a surface hardness of HRC55 and improves erosion resistance by 70% for coastal pile foundation templates
The bonding strength of duplex stainless steel spray coating is ≥ 50MPa, and the service life of the repair layer reaches 80% of the base material. The corroded template has been repaired
3、 Strengthen the maintenance system
Dynamic monitoring system
Implant corrosion sensors (such as ER probes) to monitor corrosion rate in real-time and automatically alert for exceeding standards
Establish a digital corrosion map to locate high-risk corrosion points (such as welds and corners)
Cleaning and maintenance procedures
Daily cleaning: Use a high-pressure water gun (3-5MPa) to flush surface deposits and prevent electrochemical corrosion
Weekly inspection focus: Check the integrity of the surface passivation film and restore the oxide layer using a 10% citric acid solution
Quarterly deep maintenance: use nitric acid passivation (concentration 20%)+epoxy coating touch up (thickness ≥ 80 μ m)
4、 Economic comparison (using a 10 ton template as an example)
Initial cost of the plan: 5 years, maintenance cost: 10 years, total cost: expected lifespan
Pure carbon steel+ordinary anti-corrosion 42000 yuan 180000 yuan 222000 yuan ≤ 5 years
304 stainless steel composite plate 150000 yuan 60000 yuan 210000 yuan ≥ 15 years
316L+laser cladding 280000 yuan 30000 yuan 310000 yuan ≥ 25 years
Optimal recommendation: 316L composite formwork is recommended for coastal bridge engineering, which saves 35% of the total lifecycle cost compared to carbon steel solutions
5、 Key points of policy compliance
According to the "Durability Code for Concrete Structures of Industrial Buildings" (GB/T 50476), the protection level for heavily corroded areas must reach Level III
The use of water-based anti-corrosion coatings must comply with the Technical Specification for Low Volatile Organic Compound Coatings (HJ 2537-2025)