16 Da Vinci Way, Forrestdale, Western Australia 6112
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    Monday to Thursday - 6am to 3pm
    Friday - 5am to 1.30pm. Saturday & Sunday are closed
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    +61 (0)8 9497 3500

Passivation of Stainless Steel

Passivation is a key part of the pickle and passivation process, which restores the chromium oxide layer, restoring the corrosion resistant properties of stainless steel.

Passivation is a key part of the pickle and passivation process, which restores the chromium oxide layer, restoring the corrosion resistant properties of stainless steel.

At International Corrosion Services we have developed a system where stainless steels are instantaneously passivated in the pickling bath.

Our pickle and passivation bath is the largest in Western Australia, using a unique system that pickles and passivates your stainless steel in full compliance.

Features of our

Pickle and Passivation bath

Pickle and Passivation bath

• Mixer for circulation of the pickling bath.
• Temperature sensor.
• Electrical heaters.
• Electrical control panel and control units.
• Bath cover/lid (manual handling).
• Fumes exhaust system.
• Chemical filtration.
• Waste Disposal and recycling system.
• 10 tonne and 5 tonne overhead cranes.

AFTER TREATMENT YOUR STAINLESS STEEL IS RETURNED TO YOU WITH A CERTIFICATE OF CONFORMITY.

We are also able to utilise double dipping methods and/or spray pickling and passivation for items which are too large for the bath or are immobile and must be treated onsite. Stainless steel is known and utilised for its corrosion resistance even in environments in which other materials would corrode. The corrosion resistance of stainless steel is due to a thin oxide layer found on the surface of the steel, referred to as a ‘passive layer’, as it renders the surface electrochemically passive even in corrosive environments.

“chemical treatment of a stainless steel with a mild oxidant, such as a nitric acid solution, for the purpose of enhancing the spontaneous formation of the protective passive film.”

 Degradation of corrosion resistance can occur during fabrication if austenitic stainless steels are exposed to high temperature ranges. If exposed to these temperatures for too long, areas near the metal grain boundaries can lose their corrosion resistance. This weakness caused by exposure is referred to as ‘sensitisation’. Damage to the passive layer can destroy the self-passivating properties of stainless steel.

Through our many years of experience, International Corrosion Services have found that the optimal method to both descale and remove the heat affected zones is a concentration of hydrofluoric acid. We utilise a unique system with a nitric or similar oxidizer, which is then used to passivate the steel and reforms the chromium layer – restoring the corrosion resistance. Although stainless steel does self passivate after 24 to 48 hours, the passive layer is instantaneously formed in the bath blend.

Another method of passivation is also to apply the Avesta FinishOne Passivator 630 after pickling or using mechanical cleaning methods.

“Example of non-treated stainless steel 18 months after installation”

Our Standard operating procedures are compliant to:

• ASTM A380
• ASTM A967
• AS 1627.1
• A 1627.5

Pickling Stainless Steel

Electropolishing

Corrosion Managment Control

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