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2026 New Standards: A Collection of Corrosion Protection Coating Requirements for W Beam Guardrails
Release time:
2026-02-01
The new national standard GB/T 18226-2025 Technical Requirements for Corrosion Protection of Steel Components in Highway Traffic Engineering will be officially implemented on March 1, 2026. It unifies the specifications for core indicators such as classification, thickness, adhesion amount, adhesive force and salt spray resistance of corrosion protection coatings commonly used for W beam guardrails. The accurate collection is as follows.
I. Core Standards and Scope of Application
II. Requirements for Commonly Used Corrosion Protection Coatings (Classified by Process)
(I) Hot-dip Galvanized Coating (Single Coating)
Component Type | Average Zinc Coating Adhesion Amount | Average Zinc Coating Thickness | Minimum Local Thickness | Adhesive Force | Salt Spray Resistance |
Main components (guardrail plates, columns, anti-blocks, brackets, etc.) | ≥600g/㎡ | ≥85μm | ≥61μm | Cross-cut test: Grade 0 | ≥1000h, no red rust |
Fasteners (bolts, nuts, etc.) | ≥350g/㎡ | ≥49μm | ≥35μm | Cross-cut test: Grade 0 | ≥500h, no red rust |
(II) Hot-dip Galvanizing + Spraying Composite Coating
Component Type | Zinc Coating (Adhesion Amount/Thickness) | Spraying Coating Thickness | Adhesive Force | Salt Spray Resistance |
Main components | ≥275g/㎡ (≥39μm) | ≥76μm | Cross-cut test: Grade 0 | ≥1500h, no red rust |
Fasteners | ≥350g/㎡ (≥49μm) | No specific requirement | Cross-cut test: Grade 0 | ≥1000h, no red rust |
(III) Hot-dip Galvanizing + Dipping Composite Coating
Component Type | Zinc Coating (Adhesion Amount/Thickness) | Dipping Coating Thickness | Adhesive Force | Salt Spray Resistance |
Main components | ≥275g/㎡ (≥39μm) | ≥250μm | Cross-cut test: Grade 0 | ≥2000h, no red rust |
Fasteners | ≥350g/㎡ (≥49μm) | No specific requirement | Cross-cut test: Grade 0 | ≥1000h, no red rust |
(IV) Epoxy Zinc-based Composite Coating
Component Type | Epoxy Zinc-based Coating Thickness | Polyester Spraying Coating Thickness | Total Thickness | Adhesive Force | Salt Spray Resistance |
Main components | 36-56μm | 70-90μm | ≥106μm | Cross-cut test: Grade 0 | ≥2000h, no red rust |
Fasteners | ≥350g/㎡ (≥49μm) | No specific requirement | — | Cross-cut test: Grade 0 | ≥1000h, no red rust |
III. Key General Requirements
IV. Key Comparison Points between New and Old Standards
V. Application Scenario Suggestions
Coating Type | Applicable Environment | Service Life | Advantages |
Hot-dip Galvanized Coating | Ordinary highways, inland areas | 15-20 years | Low cost, mature technology |
Hot-dip Galvanizing + Spraying Composite Coating | Municipal roads, landscape areas | 20-25 years | Attractive appearance, good weather resistance |
Hot-dip Galvanizing + Dipping Composite Coating | Coastal areas, high salt spray areas | 25-30 years | Strong corrosion resistance |
Epoxy Zinc-based Composite Coating | Heavy industrial areas, acid rain areas | More than 30 years | Environmental protection, excellent anti-corrosion performance |
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2026 New Standards: A Collection of Corrosion Protection Coating Requirements for W Beam Guardrails
The new national standard GB/T 18226-2025 Technical Requirements for Corrosion Protection of Steel Components in Highway Traffic Engineering will be officially implemented on March 1, 2026. It unifies the specifications for core indicators such as classification, thickness, adhesion amount, adhesive force and salt spray resistance of corrosion protection coatings commonly used for W beam guardrails. The accurate collection is as follows.
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