Pickling Process

Chemical Surface Treatment

Professional pickling and passivation services

ISO Certified

Chemical Surface Treatment

Our pickling and passivation services remove impurities and restore the protective oxide layer on stainless steel components, ensuring maximum corrosion resistance and extended lifespan.

We use specialized chemical treatments to eliminate weld discoloration, heat tint, and surface contaminants while enhancing the natural corrosion resistance of stainless steel.

With over 15 years of experience, our team follows strict quality control protocols to deliver consistent, reliable results for critical industrial applications.

Restores corrosion resistance
Removes welding scale
Eliminates surface contamination
Enhances material longevity
Improves surface appearance
Compliant with industry standards

Our Treatment Process

A systematic approach to restoring and protecting stainless steel surfaces

1

Surface Preparation

Thorough cleaning and degreasing of stainless steel surfaces to remove oils, dirt, and loose contaminants before chemical treatment.

2

Pickling Treatment

Application of acid solution to remove heat tint, weld scale, and oxide layers, revealing clean base metal and restoring chromium levels.

3

Passivation Process

Chemical treatment that promotes formation of a protective chromium oxide layer, maximizing corrosion resistance and material performance.

Why Choose Our Services

Essential treatments for maintaining the integrity and performance of stainless steel

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Removes Contamination

Pickling eliminates iron contamination, welding scale, and heat tint that compromise the protective chromium oxide layer.

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Restores Protection

Passivation forms a uniform chromium-rich oxide layer that provides superior corrosion resistance and extends service life.

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Ensures Compliance

Our treatments meet ASTM A380, A967, and industry standards for pharmaceutical, food processing, and critical applications.

Our Work Gallery

Showcasing our professional pickling and passivation results

Pickling Process

Pickling Treatment

Chemical removal of surface impurities

Passivation Process

Passivation Process

Creating protective oxide layer

Finished Components

Finished Components

Ready for industrial use

Technical Specifications

Industry-standard processes and quality assurance

Pickling Specifications

  • Acid concentration: 10-20% nitric acid + 2-5% hydrofluoric acid
  • Temperature range: 20-60°C
  • Immersion time: 10-30 minutes
  • Removes welding scale and heat tint
  • Compatible with all stainless steel grades

Passivation Specifications

  • Nitric acid concentration: 20-50%
  • Temperature: 20-25°C
  • Immersion time: 30-120 minutes
  • Forms chromium-rich passive layer
  • ASTM A967 and A380 compliant

Industry Applications

Trusted solutions across demanding industries and critical applications

Pharmaceutical Equipment

  • Critical components
  • Sterile surfaces
  • Processing equipment
  • Reactor vessels
  • Storage tanks

Food Processing

  • Machinery components
  • Food safety equipment
  • Processing lines
  • Mixers and blenders
  • Conveyor systems

Chemical Processing

  • Storage tanks
  • Reactor vessels
  • Piping systems
  • Heat exchangers
  • Valves and fittings

Frequently Asked Questions

Common questions about pickling and passivation services

What is the difference between pickling and passivation?
Pickling removes surface contaminants, welding scale, and heat tint using acid solutions, while passivation enhances the natural corrosion resistance by promoting the formation of a protective chromium oxide layer on the stainless steel surface.
How long does the pickling and passivation process take?
The complete process typically takes 2-4 hours depending on the size and complexity of the components. Pickling usually requires 10-30 minutes, while passivation takes 30-120 minutes, plus preparation and rinsing time.
Which stainless steel grades can be treated?
We treat all standard stainless steel grades including 304, 304L, 316, 316L, 321, 347, 410, 420, and 430. The chemical concentrations and treatment times are adjusted based on the specific alloy composition.
What quality standards do you follow?
Our processes comply with ASTM A380, ASTM A967, and other international standards. We maintain detailed documentation and can provide material certifications and test reports for all treated components.

Restore Your Stainless Steel

Protect your investment with professional pickling and passivation services that ensure long-lasting corrosion resistance and optimal performance.

Get Surface Treatment Quote