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Paint Bending Performance of Color-Coated Aluminum Sheets: Key Factors & Solutions

2025-12-09
Latest company news about Paint Bending Performance of Color-Coated Aluminum Sheets: Key Factors & Solutions

Paint Bending Performance of Color-Coated Aluminum Sheets: Key Factors & Solutions

 

Bending is a critical process for color-coated aluminum sheets in architectural cladding, automotive parts, and furniture. Poor paint bending performance leads to cracking, peeling, or chipping—ruining aesthetics and durability. Below is a breakdown of core factors, testing methods, and fixes.

 

latest company news about Paint Bending Performance of Color-Coated Aluminum Sheets: Key Factors & Solutions  0

 

1. Key Factors Affecting Paint Bending Performance

 

Factor Category Details
Base Aluminum Alloy - 1100/3003/5052 series: Excellent ductility, ideal for bending (e.g., 5052-H32 allows 1×thickness radius) .- 6061/7075 series: Brittle (6061-T6 needs 3×thickness radius; 7075-T6 is not recommended) .
Paint Type - PVDF: Superior flexibility (T-bend rating 0T-1T), resists cracking .- Polyester: Lower flexibility (T-bend rating 2T-3T), prone to damage in tight bends .
Bending Parameters - Minimum radius: Depends on thickness/alloy (e.g., 1mm 5052-H32 needs ≥1mm radius) .- Angle: 90° bends stress paint more than gentle curves.
Coating Process - Thin, uniform coatings (20-30μm) bend better than thick layers.- Poor adhesion (from inadequate surface pre-treatment) causes peeling.

 

 

2. Testing Standard: T-Bend Test

The most common method to evaluate performance (per GB/T 23443-2009 ):
  1. Cut a 100×50mm sample from the color-coated sheet.

  2. Bend the sample around a mandrel to 180° without cracking the paint.

  3. Rate by mandrel diameter relative to sheet thickness (t):

    • 0T: Mandrel = 0×t (best performance, typical for PVDF).

    • 1T: Mandrel = 1×t (good, for most architectural uses).

    • ≥3T: Poor (unfit for bending applications).

  4. latest company news about Paint Bending Performance of Color-Coated Aluminum Sheets: Key Factors & Solutions  1

 

3. Common Issues & Solutions

Issue Root Cause Solution
Paint Cracking Small bending radius; brittle alloy/paint - Increase radius to meet alloy requirements (e.g., 6061-T6 needs 3×t) .- Switch to PVDF or anneal hard alloys.
Paint Peeling Weak coating adhesion - Improve pre-treatment (degrease, phosphate).- Use adhesion promoters.
Surface Chipping Thick coating; rough bending tool - Control coating thickness (20-30μm).- Use smooth, rounded tools.

 

4. Quick Selection Guide for Bending Projects

Application Recommended Alloy
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