High Purity 99.6% Oxalic Acid Dihydrate for Effective Rust Removal and Metal Cleaning

Oxalic acid, chemically known as ethanedioic acid (H₂C₂O₄), is a powerful organic dicarboxylic acid with wide-ranging industrial applications. Our premium Oxalic Acid Dihydrate grade, guaranteed at 99.6% purity, stands out as a superior Rust Remover and Metal Cleaning Agent.

This colorless, crystalline substance is renowned for its exceptional chelating properties and reducing capabilities, making it indispensable in metal surface treatment, textile processing, and pharmaceutical synthesis. The dihydrate form (C₂H₂O₄*2H₂O) offers optimal stability and solubility characteristics for industrial applications.

With its unique ability to form soluble complexes with iron ions, oxalic acid has revolutionized rust removal processes while maintaining metal integrity. Our production follows strict ISO standards, ensuring batch-to-batch consistency in particle size distribution, acid strength, and chemical composition.

This high-purity product undergoes multiple recrystallization processes to eliminate impurities like heavy metals, chlorides, and sulfates that could interfere with critical applications. As global industries increasingly prioritize efficient and environmentally conscious cleaning solutions, our 99.6% oxalic acid dihydrate delivers unmatched performance in metal treatment while meeting stringent environmental regulations.

The efficacy of oxalic acid as a Rust Remover stems from its unique chemical interaction with iron oxides. When applied to corroded surfaces, oxalic acid reacts with ferric oxide (Fe₂O₃) - the primary component of rust - to form ferric oxalate complexes. These water-soluble complexes effectively dissolve rust while minimally affecting the underlying base metal.

The chemical reaction proceeds through a two-stage process:

• The acid protonates the oxide layer, breaking the iron-oxygen bonds
• The oxalate anions coordinate with iron ions to create stable, soluble coordination compounds

This dual-action mechanism allows for thorough rust removal without the abrasive damage associated with mechanical methods. Unlike hydrochloric or sulfuric acid treatments that can cause hydrogen embrittlement in steel, oxalic acid's milder acidity (pKa₁=1.25, pKa₂=4.14) provides controlled etching that preserves tensile strength while eliminating corrosion products.

This makes it particularly valuable for restoring antique metal objects, automotive parts, marine equipment, and architectural metalwork where preserving original material is crucial. The 99.6% purity ensures consistent reaction rates and prevents introduction of contaminants that could cause secondary corrosion.

Recommended Application: For industrial applications, we recommend 2-10% aqueous solutions applied by brushing, spraying, or immersion, followed by thorough rinsing with alkaline water to neutralize residual acidity.

Beyond rust removal, oxalic acid serves as a versatile Metal Cleaning Agent in metal finishing and surface preparation industries. Its applications span aluminum brightening, copper cleaning, stainless steel passivation, and precious metal refining.

Key Applications:

• Aluminum Processing: Forms the electrolyte in anodizing baths, creating durable, corrosion-resistant oxide layers while producing attractive golden to bronze decorative finishes
• Copper and Brass Cleaning: Removes tarnish by converting insoluble copper oxides into soluble copper oxalate complexes without damaging delicate patina
• Stainless Steel Treatment: Effectively removes welding scale and heat tints through reducing action on chromium oxides
• Industrial Cleaning: Synergizes with surfactants and corrosion inhibitors for heat exchangers, boilers, and processing equipment

The 99.6% purity is critical in these applications, as impurities can cause uneven cleaning, surface pitting, or undesirable coloring. Its biodegradability and breakdown into carbon dioxide and water make it an environmentally preferable alternative to persistent synthetic chelators like EDTA.

Our technical support includes comprehensive guidance on solution preparation, temperature optimization (typically 60-80°C for maximum efficiency), safety protocols, and waste treatment methods to help customers achieve optimal cleaning results while maintaining regulatory compliance and workplace safety standards.

While highly effective, oxalic acid requires careful handling due to its toxicity and corrosive properties. We provide detailed Safety Data Sheets outlining proper personal protective equipment (PPE) requirements, including chemical-resistant gloves, face shields, and ventilation systems.

Packaging Options:

• 25 kg bags
• 1000 kg intermediate bulk containers (IBCs)

All packaging includes moisture barriers to maintain product integrity during storage and transportation. For large-scale industrial users, we provide customized delivery schedules and on-site technical consultations to optimize usage efficiency and cost-effectiveness.