Passivation Treatment of Stainless Steel Brewing Equipment

Stainless Steel Brewing Equipment Material Characteristics

Common Stainless Steel Types

• 304 Food-Grade Stainless Steel: The most commonly used material for brewing equipment, containing 18% chromium and 8% nickel

• 316L Medical-Grade Stainless Steel: Higher corrosion resistance, suitable for high-end equipment

• 430 Stainless Steel: Lower cost but lower corrosion resistance

Material Selection Criteria

• Complies with GB 4806.9-2016 National Food Safety Standard

• Surface Finish Requirements (Ra ≤ 0.8μm)

• Welding Process Requirements (primarily argon arc welding)

Detailed Explanation of Passivation Treatment Technology

Passivation Process Principles

• Chemical Removal of Free Surface Iron Ions

• Promotes the Formation of a Chromium Oxide Protective Layer

• Improves Material Corrosion Resistance by Over 300%

Standard Process Flow

• Alkaline Degreasing → Pickling → Passivation → Neutralization → Pure Water Rinse

• Key Parameter Control (Temperature, Time, Concentration)

• Quality Inspection Methods (Blue Spot Test, Salt Spray Test)

Latest Industry Technology Developments

• Electrolytic Polishing and Composite Passivation Technology

• Application of Environmentally Friendly Passivation Solutions

• Automated Passivation Production Line

Key Points in Equipment Manufacturing Process

Structural Design Specifications

• Avoiding Dead Angles (Corner Radius ≥ 10mm)

• Evacuation Slope Requirements (≥ 3°)

• Quick-Release Connection Structure

Welding Process Control

• Internal Weld Grinding and Polishing

• Argon-Shielded Welding

• Post-Weld Heat Treatment

Surface Treatment Standards

• Mechanical Polishing (240-400 Grit)

• Electrolytic Polishing (Mirror Finish)

• Special Texture Treatment

Quality Inspection System

Material Verification

• Material Spectroscopic Analysis

• Thickness Measurement (≥ 2mm)

• Food Grade Certification

Process Inspection

• Weld X-ray Inspection

• Pressure Testing (1.5 times the working pressure)

• Sealing Test

Hygiene Standards

• Microbiological Testing

• Heavy Metal Migration Testing

• Cleaning Validation (CIP)

Industry Development Trends

Intelligent Development

• IoT Monitoring Systems

• Automated Control Systems

• Data Traceability Platform

Energy Saving and Environmental Protection

• Heat Recovery Technology

• Water Recycling

• Clean Energy Applications

Modular Design

• Quick Assembly Structure

• Flexible Expansion Solutions

• Standardized Interfaces