Anodizing, conversion & passivation · finish comparison
Stainless Steel Passivation vs Stainless Steel Pickling
Stainless Steel Passivation and Stainless Steel Pickling are both passivation & electropolishing finishes; stainless passivation resists corrosion better.
Stainless Steel Passivation
Passivation & electropolishing · $ · instant quote
Passivation removes free iron and shop contamination from stainless steel so its chromium-rich passive film can reform.
Stainless Steel Pickling
Passivation & electropolishing · $ · instant quote
Pickling chemically removes weld heat tint, oxide scale, and the chromium-depleted metal beneath it from stainless steel.
When to choose which
Choose Stainless passivation
Choose Stainless passivation when only free iron must be removed.
- Removes embedded free iron that can rust
- Adds no measurable coating thickness
- ASTM A967 and AMS 2700 offer nitric and citric methods
Choose Stainless pickling
Choose Stainless pickling when heat tint or weld scale must be removed before passivating.
- Removes weld heat tint that passivation alone cannot remove
- Eliminates oxide scale and embedded iron contamination
- Restores a clean surface before controlled passivation
What the numbers say
- Stainless passivation resists corrosion better.
- Stainless passivation is the lower-cost option ($).
Scores side by side
Each score is 0–100 against every finish in this catalog. Corrosion is derived from salt-spray test duration and surface hardness from the finish layer's Vickers hardness where a measured figure exists; a finish that leaves the base metal's own surface is not rated for hardness. Cosmetic, lubricity and cost are FabDigit's engineering assessment. Scores and typical figures are screening data, not matched side-by-side tests or service-life rankings; ASTM B117 is a controlled salt-fog method, not a field-life prediction.
| Score | Stainless passivation | Stainless pickling |
|---|---|---|
| Corrosion resistance | 34 Low | 28 Low |
| Surface hardness / wear | — — | — — |
| Cosmetic quality | 18 Low | 20 Low |
| Lubricity | 10 Minimal | 10 Minimal |
| Cost | 10 $ | 12 $ |
Key numbers
| Property | Stainless passivation | Stainless pickling |
|---|---|---|
| Thickness | 0 µm | 0 µm |
| Electrical | Unchanged | Unchanged |
| Relative cost | Budget ($) | Budget ($) |
| Added lead time | 2–4 working days | 2–5 working days |
| RoHS | Compliant | Compliant |
| Instant quote | Yes | Yes |
Bold marks the side that is ahead on a row where more (or less, for cost and lead time) is better. Ranges are the typical specification window; the drawing call-out fixes the class.
Which materials take each finish
| Material family | Stainless passivation | Stainless pickling |
|---|---|---|
| Stainless Steel | Yes | Yes |
| DMLS / SLM | With care | With care |
| Cobalt-Chrome Alloy | Limited | — |
| Titanium | Limited | Limited |
Specifications and drawing call-outs
Stainless passivation
- ASTM A967 — Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts
- AMS 2700 — Passivation of Corrosion Resistant Steels
PASSIVATE PER ASTM A967, NITRIC 2, OR AMS 2700 METHOD 1; VERIFY BY WATER IMMERSION TEST; NO VISIBLE ETCHING OR DISCOLORATION
Stainless pickling
- ASTM A380 — Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
PICKLE STAINLESS STEEL WELDMENTS PER ASTM A380 TO REMOVE ALL HEAT TINT AND SCALE, THEN PASSIVATE PER ASTM A967 CITRIC 2
Stainless passivation vs Stainless pickling — frequently asked
What is the difference between Stainless passivation and Stainless pickling?
Stainless Steel Passivation and Stainless Steel Pickling are both passivation & electropolishing finishes; stainless passivation resists corrosion better. Stainless passivation is the lower-cost option ($).
When should I use Stainless passivation instead of Stainless pickling?
Choose Stainless passivation when only free iron must be removed. Conversely: choose Stainless pickling when heat tint or weld scale must be removed before passivating.
Is Stainless passivation or Stainless pickling cheaper?
Stainless passivation is the lower-cost finish ($ against $ for Stainless pickling) among the finishes FabDigit quotes. Both are priced per part with a lot minimum; the exact figure appears on the instant quote once the part is uploaded.