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Corrosion Resistance in Anodizing Process

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Product Description

Aluminum filler metals specifically selected and refined to minimize the cosmetic difference between the weld metal and the base metal after the sulfuric or hard anodizing process. This focus dictates the use of Al-Mg alloys (like ER5356 and ER5183), while rigorously excluding high-Silicon alloys (4XXX series) that turn dark grey or black after anodizing. Our wires feature optimized Mg, Mn, and Cr content and ultra-low iron (Fe) and copper (Cu) residuals to ensure a bright, uniform, and corrosion-resistant finish that accepts color dyes evenly.

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20+ Years Experience

Over two decades of aluminum alloy wire production expertise

International Certifications

DB, CE, ABS, DNV, CCS and other authoritative certifications

200MT Monthly Capacity

Large-scale production with consistent quality

Global Export

Exporting to over 30 countries worldwide

Introduction

Anodizing is a popular finish for aluminum, enhancing both corrosion resistance and aesthetic appeal. However, the wrong filler metal can ruin the appearance. We provide the certified welding consumables that guarantee a near-perfect color match post-anodizing, which is critical for architectural, consumer goods, and decorative applications. Our technical support extends to advising clients on the specific anodizing bath chemistries and current densities that work best with our high-Mg fillers, ensuring the finished product achieves both a beautiful color and superior film hardness and uniformity.

Specification

Alloy Focus (Required)ER5356, ER5183, ER5754 (High Magnesium)
Alloy Focus (Prohibited)ER4043, ER4047 (High Silicon)
Key PropertyWeld metal accepts the anodized oxide layer with minimal color contrast
Anodizing Film TypeCompatible with Sulfuric Acid (Type II) and Hardcoat (Type III) processes
Impurity Limits (Fe/Si)Strictly limited to prevent discoloration and patchy oxide growth

Applications and Solutions

  • Architectural Structures: Welding window frames, curtain walls, and decorative panels that require a uniform, durable anodized finish.

  • Consumer Electronics: Fabrication of high-end aluminum device enclosures and casings where aesthetics are paramount.

  • Automotive Trim and Rails: Welding visible aluminum components that receive a clear or colored protective anodized coating.

  • Anodizing Repair: Using Al-Mg rods for repair welding on anodized base material, allowing the repaired area to be re-anodized with acceptable color results.

FAQ

  • Q: Why do silicon-containing fillers (ER4043) turn dark after anodizing?A: During anodizing, the high concentration of silicon in the weld metal does not form a transparent oxide layer. Instead, the silicon is left behind as a residue in the oxide film, appearing as a dark grey to black smudge that is highly visible.
  • Q: Are 5XXX welds perfectly color-matched after anodizing?A: No, there is usually a slight color difference, often appearing a slightly whiter or lighter grey than the base metal. However, this contrast is minimal and generally acceptable, unlike the severe contrast created by 4XXX fillers.
  • Q: Can I anodize aluminum that was welded with ER5356?A: Yes. ER5356 is one of the most common and effective fillers for welds intended for anodizing, offering good corrosion resistance and cosmetic results.

Advantages and Core Features

  • Aesthetic Uniformity: Achieves a light-grey to clear finish after clear anodizing, closely matching the base metal (e.g., 6063 or 5052).

  • Dye Acceptance: The Al-Mg oxide layer accepts color dyes (e.g., gold, black, blue) more uniformly and vibrantly than the dull finish of Al-Si welds.

  • Enhanced Corrosion Barrier: The resulting oxide film on the weld metal provides excellent additional resistance to abrasion and environmental attack.

  • Reduced Rework: Eliminates the costly steps of grinding out discolored welds or masking welds before the anodizing bath.

Material Selection Guide

If anodizing and color matching is a non-negotiable requirement, you must select an Al-Mg filler (ER5356, ER5183, ER5754). The choice should balance cosmetic need with cracking risk (5356 is better than 5183 for cosmetics but slightly higher cracking risk on 6XXX base). ER4043 and ER4047 are strictly prohibited for applications that require post-weld anodizing.

About Us

Coming From China, Marketing To The World.

Hangzhou Kunli welding materials Co., Ltd. is China Corrosion Resistance in Anodizing Process Manufacturers and Wholesale Corrosion Resistance in Anodizing Process OEM/ODM Suppliers. We are located in the industrial zone of Puyang Town, Xiaoshan District, Hangzhou, Zhejiang Province. It is a high-technology enterprise specializing in the research, development and manufacturing of high-performance. The company has more than 20 years of aluminum alloy wire production experience, with international advanced manufacturing equipment, complete testing equipment,stable production process and strict quality control system.
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