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Cranston
Cranston
401.943.9900 Mon - Fri 08:00 - 4:30 1425 Cranston St Cranston, RI 02920
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AMS 2700 and ASTM A967 Passivation of Stainless Steel

Home » Technical Specifications » AMS 2700 and ASTM A967 Passivation of Stainless Steel

DiFruscia Industries passivates stainless steel to AMS 2700 and ASTM A967 under Nadcap accreditation for chemical processing (AC7108) and an AS9100D quality system. See Passivation.

What passivation does

Stainless steel resists corrosion because of a thin, chromium-rich oxide film on its surface. Machining, forming and handling leave free iron and other contaminants behind that can rust and break that film down. Passivation dissolves the free iron so a clean, uniform passive layer can form. It adds no coating and doesn’t change dimensions or the look of a properly prepared part, so it suits finished, close-tolerance components.

The two specifications

Specification Scope Where you see it
AMS 2700 Passivation of corrosion-resistant steels Aerospace and defense drawings
ASTM A967 Chemical passivation treatments for stainless steel parts Commercial, industrial and medical drawings

Both specifications define nitric and citric acid methods and verification tests such as water immersion, humidity, salt spray and copper sulfate. DFI confirms the method and test for your part.

How to call it out on the drawing

  • Name the spec, method and test, or let DFI recommend one for your alloy.
  • Remove heat tint and scale first. Passivation won’t remove weld discoloration, scale or embedded contamination. Those need pickling or mechanical cleaning beforehand.
  • Identify the alloy. Austenitic, martensitic, ferritic and precipitation-hardening grades each need different treatment conditions.

Where you’ll find it

Medical devices, aerospace hardware, food equipment and firearm components.

How the job runs

  1. Clean: remove oils, coolants and shop soils.
  2. Passivate: an acid bath dissolves free iron.
  3. Rinse: a thorough rinse removes residues.
  4. Verify: test per the specification.

Get a quote or a data sheet

Send the drawing and the spec callout to rfq@difruscia.com, or use Request a Quote. DFI’s technical data sheet for this process is available on request from Technical Specifications. Questions: 401.943.9900 or support@difruscia.com.

Values shown are typical results for reference only and are not specification limits. Results vary with alloy, part geometry, thickness and process parameters. Contact DFI to confirm the requirements for your application.