What passivation costs in Canada (and why it is priced by the lot)

Passivation is a batch process priced by the lot with a minimum charge, usually cheaper than plating. Citric vs nitric, testing adders, and how to quote it.

Quick answer (CAD, as of November 2026): Passivation is a batch chemical process, priced by the lot, not the part, with a minimum charge, so a handful of parts costs about the same as a full rack. It is usually cheaper than plating because nothing is deposited and no current is applied; the cost is the tank time, labour and any testing. Citric and nitric both work; citric runs faster and is cheaper to dispose of. No Canadian shop publishes a rate, and most bundle passivation into the part quote. For a few parts, the cheapest move is to send them along with a plater's next lot.

How passivation is priced

Passivation cleans and re-forms the protective oxide on stainless steel. It is a bath process: the parts go into an acid tank and a rinse, for at least twenty minutes a batch, and the shop needs the tanks, a hoist and baskets, and a person to run it. Those costs are the same whether you send five parts or fifty, which is why there is a minimum and why the chemicals themselves are a minor part of the bill. The trade publication Products Finishing makes the point plainly: the cost drivers are labour, capital, existing volume and job size, not the acid. So the controlling question is whether your work fills a lot.

Why a few parts cost almost as much as a rack

Because the batch runs the same either way. This is the same minimum-lot logic as plating and anodizing: the first few parts carry the floor. For a small handful of parts, the practical advice from the trade is to take them to a job shop or a plater and have them ride along with an existing lot, rather than pay a dedicated minimum.

Citric vs nitric

Both passivate to the same specs (ASTM A967, AMS 2700). Nitric acid is the cheaper chemical to buy, but citric usually wins on total cost: its cycles can run as short as four minutes, so throughput is higher, and it is far cheaper to dispose of, where nitric needs expensive waste treatment. For most buyers the choice is the shop's to make; if you have a preference (citric is the greener option), state it.

Passivation usually costs less than plating

There is no deposited metal layer, no electric current and no precious-metal chemistry, so passivation is generally cheaper than electroplating and much cheaper than electropolishing. It is a cleaning and conversion step, not a coating. If your stainless part only needs its corrosion resistance restored after machining, passivation is the economical answer.

Testing is a separate line

If your spec calls for verification, the test is its own charge: salt spray, copper sulfate or high-humidity, each a modest per-test fee (a US lab's published schedule put these around $75 to $150 USD each). High-humidity is a non-toxic alternative to copper sulfate. Order only the acceptance test your spec requires.

What to send for a quote

The alloy and condition, the part size and quantity, the spec (ASTM A967 or AMS 2700, and citric or nitric if you care), and any acceptance test. Send it once and request quotes from Canadian finishers; many stainless fabricators and platers passivate in-house and fold it into the part price.

FAQ

How is passivation priced?

By the lot, driven by tank time, labour and testing, with a minimum charge. The chemicals are a minor cost, so a few parts cost nearly what a rack does. Many shops bundle it into the part quote rather than list it separately.

Is there a minimum charge?

Effectively yes, because the bath runs the same for a few parts or many. For a small handful, send them along with a plater's or job shop's existing lot instead of paying a dedicated minimum.

Does passivation cost more than plating?

No, usually less. Nothing is deposited and no current is applied, so it is a simpler process than plating and far cheaper than electropolishing.

Citric or nitric, which is cheaper?

Nitric is the cheaper chemical, but citric usually wins on total cost through faster cycles and much cheaper disposal. Both meet ASTM A967 and AMS 2700.

How much does the testing cost?

Each verification test (salt spray, copper sulfate, high-humidity) is a separate modest fee; a US lab's schedule put them around $75 to $150 USD each. Order only the test your spec requires.

How do I reduce passivation cost?

Batch parts to beat the minimum, let the shop pick citric for faster cheaper processing, and specify only the acceptance test you actually need.

Last reviewed: November 2026. No Canadian shop publishes a passivation rate, so this guide teaches the pricing mechanic; the testing figures are a US lab's in USD and labelled as such, and the citric-versus-nitric cost logic is from finishing-industry sources. Related reading: what is passivation and plating cost.