Tecoats Electroplaters LLP

Ferrous Material – Stainless Steel

Enhancing corrosion resistance and durability of stainless steel and other metals through advanced passivation treatments.

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Services ⇨ Passivation
Passivation Benefits
A clean and corrosion-resistant surface after passivation

What is Passivation?

Passivation is a non-electrolytic chemical process that removes free iron and other surface contaminants from stainless steel and other metals to enhance their natural corrosion resistance.

The process creates a thin, protective oxide layer that is less likely to chemically react with air and cause corrosion. This passive layer acts as a barrier against environmental factors that could degrade the metal.

Corrosion Resistance

Dramatically improves resistance to rust and oxidation

Longevity

Extends the service life of metal components

Our Passivation Methods

Compliant with AMS-2700 F, ASTM A967 M17, and other industry standards

Passivation, Method 1 (Types 1, 2, 3, 6, 7, 8)
AMS-2700 F Compliant

Passivation process suitable for stainless steel types 1, 2, 3, 6, 7, and 8 ensuring high corrosion resistance.

  • Applicable Types: 1, 2, 3, 6, 7, 8
  • Standard: AMS-2700 Revision F
Ideal for a wide range of stainless steels
Nitric Acid Passivation
ASTM A967 M17 Compliant

Traditional passivation using nitric acid for stainless steel types 1, 2, 3, and 4, providing effective surface treatment.

  • Applicable Types: 1, 2, 3, 4
  • Standard: ASTM A967 Revision M17
Trusted process widely used in industry

Our Passivation Process

Precision-controlled steps for optimal corrosion resistance

1

Receiving Inspection

  • Visual examination of incoming parts
  • Verification against purchase order specifications
  • Material certification review
2

Manual Cleaning

  • Removal of gross contaminants
  • Deburring and edge smoothing
  • Surface preparation for chemical treatment
3

Racking

  • Proper fixturing for complete solution contact
  • Prevention of part-on-part contact
  • Optimized for solution drainage
4

Pre-Cleaning & Alkaline Cleaning

  • Removal of oils and greases
  • Alkaline soak cleaning (10-12)
  • Water break test verification
5

Acid Descaling (If Required)

  • Removal of heat tint and scale
  • Secondary water break test
6

Passivation Treatment

Bath Composition: 20 to 25% by volume of HNO3: 2 to 3% by weight Na2Cr207,2H2O. | Bath temperature: 70 to 90 M (21 to 32 'C). | Immersion Time: 30 minutes minimum

Bath Composition: 20 to 25% by volume of HNO3: 2 to 3% by weight Na2Cr207,2H2O. | Bath temperature: 120 to 130 °F (49 to 54 °C). | Immersion Time: 20 minutes minimum

Bath Composition: 20 to 25% by volume of HNO3: 2 to 3% by weight Na2Cr207,2H2O. | Bath temperature: 145 to 155 °F (63 to 68 °C). | Immersion Time: 10 minutes minimum

7

Post Treatment

  • Neutralization of residual acids
  • Hot water rinse (140-160°F)
  • Parts made from ferritic, martensitic and precipitation hardening steels shall be immersed in a solution containing 4 to 6% by weight of sodium dichromate dihydrate (Na2Cr207 - 2H2O) at 140 to 160 °F (60 to 71 *C) for 1 hour, rinsed, and dried.
8

Quality Verification

  • Water immersion testing per ASTM A967
  • Copper sulfate testing when specified
  • Salt spray testing available upon request
9

Final Processing

  • De-racking with clean gloves
  • 100% final inspection
  • Packing and documentation

Passivation Specifications

We comply with major industry standards and specifications

Standard Description Methods
AMS 2700 F Passivation, Method 1 Types 1, 2, 3, 6, 7, 8
ASTM A967 M17 Passivation, Nitric Methods 1, 2, 3, 4