Minimox® Self-Protective Alloy Treatment reduces alloy oxidation and flaking at elevated temperatures. Minimox is a safe, economical, water-based solution that is designed to be applied in the field. It works on a variety of alloys, including stainless steels, aluminum, nickel, titanium, magnesium, and superalloys and has demonstrated success over 1100°C (2000°F). One application for Minimox includes reduction of scaling on components being treated as well as protecting the furnace itself.
In short – the thermal oxides formed after Minimox® treatment have:
1. Better surface chemistry
410 stainless steel. Recommended maximum service temperature for continuous exposure in air = 620°C (1150°F). Partially treated sample below was heated to 850°C for 30 hours.
Untreated and oxidized 410 stainless. Thermal oxide is thick, flaking Fe2O3.
Minimox-treated and oxidized 410 stainless. Thermal oxide is thin, adherent Cr2O3 + Cr-Mn-O spinel, even though there is no Cr or Mn in the solution.
2. Better surface structure – no flaking or protrusions
Ni 600 alloy; 1000°C, 500 hours in air
Minimox-treated and oxidized (100x)
Untreated and oxidized (100x)
Untreated (1000x). Exposed microvoids for corrosion nucleation
- The composition of the protective layer is primarily a function of the alloy, not the coating material. For example, the protective layer that forms on aluminum alloys is different from the protective layer that forms on stainless steels.
- The temperature of oxidation is set by the alloy, not by any Minimox solution requirements.