Chemical conversion coatings on aluminum and aluminum alloys
Chemical conversion coatings on aluminum and aluminum alloys.
Alodine - chromatic passivation for aluminum is a chemical process performed at COATING under the MIL-DTL-5541 standard. The process is divided into two stages:
Type I –Compositions containing hexavalent chromium.
Type II-Compositions containing no hexavalent chromium.
CLASS 1A – for maximum protection against corrosion, painted or unpainted
CLASS 3 – for protection against corrosion where low electrical resistance is required
Yellow passivation provides an excellent corrosion resistant layer (168 hours in a salt spray chamber according to the ASTM-B-117 standard) and serves as a preparatory layer before painting.
Colors range from light yellow to brown. Different shades in the same product are natural and within standard.
Transparent passivation is almost colorless and provides an electrically conductive layer with electrical resistance up to 500 microOhm. Corrosion resistant for up to 168 hours.
