Formation of Manganese-Containing PEO Coatings on Aluminum Alloys
353
Table 6 Recommended
parameters of PEO of
aluminum alloys for
producing mixed oxide
coatings doped with
manganese
Parameter
Coating Al 2 O 3 ·MnO x
Electrolyte composition,
mol/dm 3
KOH of 0.01–0.05;
KMnO 4 of 0.005–0.05
Temperature, °C
20…25
Treatment mode
direct current, incident power
Current density, A/dm 2
15…20
Voltage, V
160…240
Treatment time, min
20…40
Content, at. %
manganese
up to 40.0
Fig. 16 3D- surface map (a) and cross section profile of Al|Al 2 O 3 MnO x (b) coating. scanning
area 5 × 5 μm
assumption is confirmed by the results of surface layers topography analyzing with
atomic force microscopy (Fig. 16).
We compared the surface topography of alloy samples with a monoxide coating
Al 2 O 3 and a mixed oxide layer Al 2 O 3 MnO x . In addition, the ratio of the hills and
353
Table 6 Recommended
parameters of PEO of
aluminum alloys for
producing mixed oxide
coatings doped with
manganese
Parameter
Coating Al 2 O 3 ·MnO x
Electrolyte composition,
mol/dm 3
KOH of 0.01–0.05;
KMnO 4 of 0.005–0.05
Temperature, °C
20…25
Treatment mode
direct current, incident power
Current density, A/dm 2
15…20
Voltage, V
160…240
Treatment time, min
20…40
Content, at. %
manganese
up to 40.0
Fig. 16 3D- surface map (a) and cross section profile of Al|Al 2 O 3 MnO x (b) coating. scanning
area 5 × 5 μm
assumption is confirmed by the results of surface layers topography analyzing with
atomic force microscopy (Fig. 16).
We compared the surface topography of alloy samples with a monoxide coating
Al 2 O 3 and a mixed oxide layer Al 2 O 3 MnO x . In addition, the ratio of the hills and