Colmonoy® 686 for High Temperature and Corrosion Resistance in Waste to Energy & Biomass Plants

Wall Colmonoy announces the release of Colmonoy® 686, a Ni-Cr-Mo-W superalloy. Colmonoy® 686 is a nickel-based powder specifically developed to combat the extreme high temperature and corrosion experienced in modern waste-to-energy and biomass plants.

In this type of environment, tube surface temperatures can reach in excess of 550°C, placing enormous strain on waste-to-energy and biomass parts, such as boiler tubes, water-walls and superheaters due to the presence of chlorine and sulphur, which form corrosive compounds.

Where there is an existing nickel-based alloy in use, Colmonoy® 686 can easily be integrated and is fully compatible with alloys such as Inconel™ 625 or Colmonoy® 625 without posing an operational risk.

Colmonoy® 686 is primarily applied via laser cladding, though the alloy can also be applied by PTA or HVOF. Colmonoy® 686, laser deposited, can achieve a nominal hardness of 99HRB.

Laser-cladded-tube-panels-installed-in-the-combustion-chamber-of-a-waste-to-energy-plant-CropedLaser-cladded tube panels installed in the combustion chamber of a waste-to energy plant. Image courtesy of Häuser & Co.

Our customers asked for an alloy that performed even better than Colmonoy® 625 for resistance to hot gas corrosion in high temperature environments. We developed Colmonoy® 686 with a pitting resistance equivalent number of 81!

Chart with Pitting Resistance

Colmonoy® 686 is currently in selected European Biomass and Waste to Energy Plants.

With such high pitting resistance and higher molybdenum and chromium levels than existing alloys, Colmonoy® 686 can provide superior protection against hot-gas corrosion.

Membrane wall with Colmonoy 686 coating, application by laser claddingSource Haeuser & CoMembrane water-wall in a Waste-to-Energy Plant with Colmonoy® 686 coating, applied by laser cladding. Image courtesy of Häuser & Co.

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