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Corrosion Resistance in Chemical Environments

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Product Description

Aluminum filler metals selected for their resistance to specific corrosive media, including mild acids, bases, and organic chemicals, often exceeding the requirements for simple atmospheric exposure. ER5356 is often utilized for alkaline environments, while specific high-purity ER1100 or specialized Al-Mn (3XXX series) fillers are chosen for their stability in certain low-concentration acid solutions. The key is ensuring the weld metal's resistance to uniform dissolution and localized attack (pitting/crevice corrosion) in the specific chemical bath, often dictated by the base metal's performance (e.g., 3003, 5052).

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20+ Years Experience

Over two decades of aluminum alloy wire production expertise

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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

Chemical processing, food and beverage, and pharmaceutical industries rely on aluminum for its lightweight and non-toxic properties. Selecting the right filler metal is paramount when welding tanks, heat exchangers, and piping exposed to chemical agents. We provide guidance on selecting filler metals that are chemically stable within a specific pH range and concentration. Our material certification includes a focus on low impurity levels, as tramp elements accelerate attack in chemical baths, ensuring the weld joint maintains a passive, protective oxide layer essential for long-term service in these environments.

Specification

Alloy FocusER5356 (Alkaline), ER1100 (Purity/Conductivity), ER4043 (General)
Key PropertyResistance to Uniform and Localized Chemical Attack (pH specific)
Chemical ControlImpurity levels optimized for the base metal's required chemical stability
pH Range FocusGenerally between pH 4.5 and pH 8.5 for best performance
Material InteractionWeld metal must not leach undesirable elements into the process stream

Applications and Solutions

  • Food and Beverage Tanks: Welding high-purity aluminum vessels and piping for contact with food products and cleaning agents.

  • Nitric Acid Storage: Utilizing specific aluminum alloys (often 3003) and their matching fillers for handling concentrations of HNO3​.

  • De-Ionized Water Systems: Welding high-purity aluminum piping for ultra-pure water systems in semiconductor manufacturing.

  • General Chemical Containers: Repair and fabrication of storage units exposed to varying chemical fumes or spill hazards.

FAQ**

  • Q: What pH range is safe for aluminum?A: Aluminum relies on its passive oxide layer. It performs best in the neutral range, typically pH 4.5 to pH 8.5. It corrodes rapidly in strong acid (pH <4) and strong base (pH >9).
  • Q: Is ER5356 better than ER4043 for chemical resistance?A: It depends on the chemical. ER5356 (high Mg) is generally better in mildly alkaline solutions. ER4043 (high Si) can show better resistance in some mild acidic environments, but this must be verified for the specific medium.
  • Q: Why are high-purity alloys used for de-ionized water systems?A: De-ionized water is extremely aggressive as it seeks ions. High-purity alloys (like ER1100 or 5XXX) are used to prevent the rapid leaching of alloying elements (like Cu or Zn) from the weld metal into the water stream, which could contaminate the process.

Advantages and Core Features

  • pH Stability: Specific alloy chemistries provide the widest possible resistance band to chemical dissolution within the pH neutral range.

  • Minimized Leaching: High-purity options (like ER1100) ensure the weld deposit introduces minimal trace elements into the contained chemical medium.

  • Corrosion Resistance Match: The filler is carefully selected to ensure its corrosion rate matches or exceeds that of the base metal, preventing premature weld failure.

  • Pitting Mitigation: Low tramp elements limit the formation of galvanic corrosion sites that initiate localized chemical attack.

Material Selection Guide

Selection is highly dependent on the corrosive agent. For mildly alkaline environments (e.g., cleaning solutions), specify ER5356. For neutral to mildly acidic high-purity systems, specify ER1100 or ER4043. Always provide the chemical name, concentration, and service temperature for a specific material recommendation. Never guess when dealing with chemical environments.

About Us

Coming From China, Marketing To The World.

Hangzhou Kunli welding materials Co., Ltd. is China Corrosion Resistance in Chemical Environments Manufacturers and Wholesale Corrosion Resistance in Chemical Environments 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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