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Ted Mooney, P.E. RET
Pine Beach, NJ

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Iridium Oxide Coating Removal

October 24, 2013

Q. I have been working on the IrO2 coating removal, HF and Titanium is clearly a difficult combination. In practice the coating spalls away until a coating pin hole develops, after which TiF4 and TiF3 effluent products sharply rise (massively). I need a specific corrosion inhibitor that can protect the parent titanium for up to 8 hrs when immersed in an HF solution. I have depleted the available products and / or information without finding a reliable solution.

Mark Schofield
- England, UK

A. Have you considered making the electrode anodic in a molten salt (sodium nitrate ⇦ this on Amazon [affil link] /sodium nitrite) bath? This may be the simplest way that avoids damaging the titanium.

Lyle Kirman
consultant - Cleveland Heights, Ohio
November 25, 2013

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