Frequently Asked Questions

Passivation is a chemical treatment process that removes free iron contamination from stainless steel and promotes the formation of a chromium-rich passive layer that improves corrosion resistance.

Passivation helps stainless steel maintain its corrosion resistance, reduces the likelihood of rust formation, and helps equipment meet customer, industry, and regulatory requirements.

Yes. Despite its name, stainless steel can rust if the passive layer is damaged, contaminated, or exposed to aggressive environments. Passivation helps restore corrosion resistance and reduce the likelihood of corrosion.

No. Passivation is commonly performed on newly fabricated parts, but it is also used as part of preventive maintenance programs for existing equipment, piping systems, tanks, and process infrastructure.

• • Pharmaceutical manufacturing
• • Biotechnology
• • Food and beverage processing
• • Aerospace and defense
• • Semiconductor facilities
• • Medical device manufacturing
• • Water and wastewater treatment
• • Chemical processing
• • Energy and hydrogen systems
• • General industrial manufacturing

The most commonly referenced standards include ASTM A967, ASTM A380, and AMS 2700. Specific customer specifications may also apply depending on the industry.

• • 304
• • 304L
• • 316
• • 316L
• • 321
• • 410
• • 420
• • 17-4PH
• • Many other stainless and specialty alloys

Contact us if you have questions about a specific material.

Passivation can remove light rust and free iron contamination. More severe corrosion, weld scale, or heavy oxide deposits may require cleaning or pickling before passivation.

Not always. Heavy heat tint and weld scale often require additional treatment before passivation can be effective.

In many applications, yes. Welding can introduce heat tint, oxides, and contamination that reduce corrosion resistance.

Yes. Pure Source regularly performs passivation on process piping, utility piping, tanks, vessels, skid systems, and other installed equipment.

There is no universal schedule. Many facilities perform passivation after fabrication, repairs, system modifications, shutdowns, or as part of preventive maintenance programs.

Electropolishing is an electrochemical process that removes a thin layer of metal from the surface, producing a smoother, cleaner, and more corrosion-resistant finish.

Passivation removes contamination and improves corrosion resistance without significantly changing the surface finish. Electropolishing removes a thin layer of material, smooths the surface, improves cleanability, and enhances corrosion resistance.

Yes. Many high-purity applications use electropolishing followed by passivation to maximize cleanliness and corrosion resistance.

Rouge is a form of iron oxide contamination that can develop on stainless steel surfaces during service, particularly in pharmaceutical, biotechnology, and high-purity water systems.

Derouging is the process of removing rouge deposits from stainless steel equipment and piping systems.

No. Early-stage rouge may be difficult to see and can exist as a thin oxide film before becoming visible discoloration.

In many cases, yes. Passivation is often performed after derouging to restore the protective passive layer.

Cleaning for Oxygen Service is a specialized cleaning process that removes oils, grease, particulates, and other contaminants from equipment used in oxygen-enriched environments.

Even small amounts of contamination can create ignition hazards in high-pressure oxygen systems. Proper cleaning helps reduce safety risks.

The most common standards include CGA G-4.1 and ASTM G93.

Yes. Certificates of cleanliness and supporting documentation are available upon request.

Medical gas line cleaning removes oils, grease, particulates, fabrication debris, and contaminants from piping systems used to distribute oxygen and other medical gases.

Yes. Fabrication, welding, assembly, and installation activities can introduce contaminants that should be removed before the system is placed into service.

• • Oxygen
• • Nitrous oxide
• • Medical air
• • Vacuum systems
• • Specialty medical gases

Yes. We provide process certifications and supporting documentation as required by customer specifications.

Traceability documents record the details of the work performed, including process information, dates, inspections, testing, and other quality records needed for audits and compliance requirements.

Yes. We regularly support customers in pharmaceutical, biotechnology, aerospace, defense, semiconductor, food and beverage, and other industries with strict documentation requirements.

Yes. Many services can be performed at customer facilities when equipment removal is impractical.

Pickup and delivery services are available throughout Southern California.

• • Part description
• • Material type
• • Quantity
• • Dimensions
• • Applicable specifications
• • Desired turnaround time
• • Photos, if available

Turnaround time depends on project size, material condition, and current workload. Expedited service may be available for urgent projects.