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Corrosion Protection of Super Duplex against Sulphuric Acid


Corrosion Protection of Super Duplex against Sulphuric Acid


Mining and Mineral Processing



July 2017



Super Duplex Steel



Chem-tect™ RB 364CS vinyl-ester glassflake

Chem-tect™ RB 300TC vinyl-ester topcoat

Chem-tect RC 364



Nickel Laterite mine operating at 100°C. Vessel is required to contain and hold Sulphuric Acid Slurry as part of the leaching process.



Internals had previously been coated with a widely accepted epoxy which failed within months causing the substrate to corrode. Pitting was experienced and protection against long term exposure to acid was required.

Externals needed protection from acid rain and atmospheric corrosion, also needing a durable hard-wearing finish.


Chemco’s Solution

Achieving adequate adhesion to Super Duplex is a challenge for every coating, RC364 was selected for its adhesion to exotic materials.

RB 300 provides excellent corrosion resistance, creating an impermeable barrier between the process environment and substrate.



Abrasive blast with Aluminium Oxide to class SA 2.5 90μm surface profile.

Apply RC364 to a DFT of 400μm on internals and externals

Apply RB364CS to a total DFT of 1mm on internals

Apply RB300TC to the total DFT of 400μm externally


Dome condition before blasting and coating
Condition before blasting and                                   coating
Dome after blasting and coating
Vessel after blasting and coating
External after blasting and coating
External after blasting and coating


After a year the tank is still in excellent condition, the client has requested the same treatment on other vessels within the site.

Coating selection, approvals and application was performed by CCS – Distributor Agent of Chemco International in Western Australia.


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