Stainless Steel Finishing
Pickling & Passivation – Restoring Stainless Steel
At SPE, we provide specialised pickling and passivation services to restore the corrosion resistance of stainless steel after fabrication or welding.
Pickling & Passivation
Why It Matters
Stainless steel relies on a thin passive oxide layer for corrosion resistance. Fabrication processes such as welding, grinding, or heating can damage this layer. Pickling and passivation restore and stabilise the protective film, ensuring long-term durability.
Our Process
- Pickling removes weld scale, discolouration, and surface contamination.
- Passivation restores the protective oxide layer by eliminating free iron and promoting oxygen bonding.
Key Benefits
- Enhanced corrosion resistance
- Clean, uniform finish
- Extended component service life
- Suitable for high-performance and demanding environments
Electrochemical Cleaning & Marking
Electrochemical Cleaning & Marking – Instant Results
SPE’s electrochemical process offers fast, precise cleaning and passivation of MIG and TIG welds without traditional pickling pastes or gels.
How It Works
- Uses an instantaneous electrolyte reaction to clean and passivate surfaces
- Produces no fumes, residue, or uneven halo marks
- Leaves welds corrosion-resistant and ready for use
Marking Capabilities
- Permanent etching of logos, serial numbers, or graphics
- Maximum mark height: 70mm; unlimited length
- Ideal for branding, batch control, or compliance
Key Benefits
- Fast, clean alternative to traditional pickling
- Immediate passivation of welds
- Durable, accurate markings
- Eco-friendly and safe
Polishing
Polishing – Refining Surfaces
Our polishing department ensures stainless steel components are visually appealing and functionally smooth.
Precision Polishing
- Three automated machines supported by skilled hand tools
- Controlled, consistent results for complex shapes and surfaces
Finishes Offered
- Brushed or satin textures using grits 36–120 and Scotch-Brite pads
- Uniform decorative finishes that enhance aesthetics and surface quality
Applications & Benefits
- Improved product appearance
- Removal of surface marks or imperfections
- Preparation for coatings or plating
- Enhanced hygiene and smoothness for sensitive environments
Frequently Asked Questions
What is the difference between pickling/passivation and electrochemical cleaning?
Pickling and passivation is a two-step chemical process for restoring corrosion resistance after fabrication, while electrochemical cleaning achieves immediate cleaning and passivation using a low-voltage electrolyte reaction.
Can all stainless steel surfaces be polished?
Yes, SPE can polish flat and complex stainless steel components to achieve brushed or satin finishes, with automated and manual methods ensuring consistency.
Does electrochemical marking damage the stainless steel surface?
No. Electrochemical marking is non-invasive and leaves a clean, permanent mark without affecting corrosion resistance or surface integrity.