12
M. V. Ved’ et al.
Fig. 1.4 2D and 3D maps of the surface and cross-sectional profile between markers 1 and 2 for
mild steel substrate. Scan area AFM 5.0 × 5.0 μm
1.1.2 FeCoMo Alloy
The elemental analysis of Fe-Co-Mo coatings deposited at direct current density
of 2 A/dm 2 from electrolytes Mo1–Mo5 shows that the metal content varies
within 2 at.% (Fig. 1.7). The maximal molybdenum content was detected in the
deposits obtained from the electrolyte Mo3 (Table. 1.2). Increasing the electrolyte
concentration at a constant ratio of components promotes the alloy’s enrichment
with cobalt when deposited at current densities of 3−6 A/dm 2 ; unfortunately,
molybdenum portion decreases (Fig. 1.7a, b). Consequently, competitive reduction
of cobalt and molybdenum in the alloy takes place that confirms involvement of
particles of various natures in electrode reactions. On the contrary, we observe
a trend to coating enrichment with molybdenum at the expense of cobalt when
increasing current density in all electrolytes (Mo1–Mo5). Also, a gradual decreasing
of iron portion by 5–6 at.% is noted with rising current density from 2 to 6 A/dm 2
(Fig. 1.7c).
M. V. Ved’ et al.
Fig. 1.4 2D and 3D maps of the surface and cross-sectional profile between markers 1 and 2 for
mild steel substrate. Scan area AFM 5.0 × 5.0 μm
1.1.2 FeCoMo Alloy
The elemental analysis of Fe-Co-Mo coatings deposited at direct current density
of 2 A/dm 2 from electrolytes Mo1–Mo5 shows that the metal content varies
within 2 at.% (Fig. 1.7). The maximal molybdenum content was detected in the
deposits obtained from the electrolyte Mo3 (Table. 1.2). Increasing the electrolyte
concentration at a constant ratio of components promotes the alloy’s enrichment
with cobalt when deposited at current densities of 3−6 A/dm 2 ; unfortunately,
molybdenum portion decreases (Fig. 1.7a, b). Consequently, competitive reduction
of cobalt and molybdenum in the alloy takes place that confirms involvement of
particles of various natures in electrode reactions. On the contrary, we observe
a trend to coating enrichment with molybdenum at the expense of cobalt when
increasing current density in all electrolytes (Mo1–Mo5). Also, a gradual decreasing
of iron portion by 5–6 at.% is noted with rising current density from 2 to 6 A/dm 2
(Fig. 1.7c).