High Temperature Alloy Improvement

Reduction of oxide scale growth on A286 superalloy

Coating with Minimox^™ solution reduces the oxide scale growth on A286 superalloy. For A286, oxidation resistance is rated as "high" for continuous service up to 1500^°F (816^°C) and intermittent service up to 1800^°F (982^°C). Minimox^™ solution-coated A286 shows no flaking at 850^°C while uncoated A286 exhibits spalling almost immediately. The graph demonstrates weight loss for the uncoated material that continues over time. The Minimox^™ solution-coated coupon shows no sign of spalling and demonstrates a stable surface oxide.

Minimox™-coated A286 Uncoated A286

Improving Oxidation Resistance of Ni 600 Alloy

Even though Ni 600 Alloy is rated for elevated temperatures, coating with Minimox™ solution can further improve its oxidation resistance and corrosion resistance. Lower mass gains translate to less oxidation.

Improving Corrosion Resistance of Ni 600 Alloy

The nanocrystalline coating process alters the nucleation and growth of thermal oxides - yielding an oxide surface that is more dense and adherent, even though it is thin. This oxidation layer improves the corrosion resistance by reducing surface imperfections and voids as demonstrated with the nickel surfaces shown below.

	Uncoated Ni 600 alloy; heated in air to 1000°C for over 500 hours. Oxide scale is blistered, flaked, and porous and has multiple protrusions. (original 100X)
	Microvoids under the blistered oxide of uncoated Ni 600 alloy are ideal sites for corrosion. These corrosion nucleation sites are absent in the nanocrystalline-coated material. (original 1000X)
	Nanocrystalline coated Ni 600 alloy; heated in air to 1000°C for over 500 hours. The oxide is dense, thin, adherent, and protective. (original 100X)