Zinc deposition with pack cementation on low carbon steel substrates

Impact of zinc halide addition on the growth of zinc-rich layers generated by sherardizing

“…The layer growth under pack cementation is best described with n ≈ 0.59. This indicates a predominantly diffusion controlled growth mode consistent with results of Vourlias et al [10], who observed a diffusion-controlled growth of the total Fe-Zn layer under pack cementation at 673 and 723 K.…”

“…4), all expected intermetallic phases are formed during sherardizing. This phase composition differs from those reported by [9][10][11][12] during sherardizing in pack cementation at 653-673 K. Jiang et al [9] observe a total Fe-Zn layer consisting of the ζ-, δ-and Γ-phase, while the authors in [10][11][12] report a coating composed of the δ-and Γ-phase.…”

“…Due to its lower process temperature compared to hot dip galvanizing sherardizing conserves functional properties like hardness [6,7]. In addition the protective layer formed by sherardizing consists solely of intermetallic Fe-Zn phases [7,9,10]. Thus, no further heat treatment is needed to create fully alloyed coatings as applied in galvannealing.…”

Corrosion behaviors of P110 steel and chromium coating in CO2-saturated simulated oilfield brine

“…The coating consists of two distinct layers: an external layer and an internal layer. Previous research has reported [16] that the external layer belongs to the Cr-compound region, while the internal layer corresponds to the Cr-diffusion zone. It is believed that this distribution has a beneficial effect on the bond strength between the coating and the matrix [15] .…”

“…The great advantage of surface treatment is it can enhance the materials surface performance against degradation and reduce the materials consumption [16][17][18] . According to a short-term benefit-cost analysis, using plain carbon steel oil casing tube is a cost effective option [1,2] .…”