Table 1.

Characteristics of the coatings.

Electrolyte	alkaline (pH = 10–11)		acid (pH = 1–2)
Coating type	CP-1	Ag-CP	CaP-2	Sr-Si-CP
Voltage, V	350–450		200–350
Thickness, μm	20–30	25–50	35–100	50–140
Roughness Ra, μm	1.5–2.5	1.5–4.0	2.0–4.5	3.0–8.0