1. Choose the right weather-resistant materials (improve resistance from the source)
Prioritize special weathering steel / alloys
Directly select materials with inherent weather-resistant properties (such as common weathering steels like Q235NHA, Q355NHA, or those conforming to ASTM A588, EN 10025-5 standards). These materials contain alloying elements such as chromium, nickel, and copper, which form a dense "oxidized rust layer" on the surface, acting like a "protective film" to prevent further erosion of the interior by moisture and oxygen.
Select materials suitable for the environment
For high salt spray environments by the sea, choose weathering steels with stronger salt resistance (such as grades with slightly higher nickel content); for dry inland environments, basic weathering steels can be used to avoid "excessive material performance" or "insufficient adaptation".
2. Optimize production and processing techniques (reduce inherent defects)
Control material processing damage
During cutting, welding, bending, and other processing, minimize surface scratches, deformation, or welding spatter on the material - these damages will destroy the natural rust layer on the surface and become "corrosion starting points". Clean welding slag promptly after welding, and if necessary, perform local grinding on the weld seams.
Ensure smooth structural drainage
Design drainage holes for weather-resistant products (such as garages, guardrails) to prevent rainwater from accumulating in corners; try to adopt "slope design" at structural joints to reduce long-term moisture retention.
3. Ensure proper surface protection treatment (actively block erosion)
Promote the formation of a "stable rust layer"
New weathering steel products can undergo "artificial rust acceleration treatment" (such as applying special rust accelerants) to speed up the formation of a uniform and dense protective rust layer on the surface, shortening the "unstable period" of natural rusting (avoiding initial rust powder falling off and polluting the environment).
Auxiliary coating protection (select as needed)
For longer-term weather resistance, weather-resistant coatings (such as fluorocarbon paint, acrylic weather-resistant paint) can be applied on the surface of weathering steel to form a "physical barrier"; outdoor plastic components can use formulas with added ultraviolet absorbers to prevent aging and embrittlement due to sun exposure.
4. Daily maintenance and upkeep (prolong service life)
Regularly clean surface impurities
Timely wipe off accumulated dust, fallen leaves, oil stains, etc., on the surface to avoid impurities blocking and forming a "local humid environment", which would damage the integrity of the rust layer.
Repair damaged parts
If there are damages or scratches on the surface rust layer, in mild cases, you can grind and then touch up with rust accelerant; in severe cases, it is necessary to clean the rust and then repair by welding or replace the parts to prevent corrosion from spreading.
