Method for electroplating chromium on stainless steel surface
A technology of electroplating chromium and stainless steel, applied in the field of electrochemistry, which can solve the problems of inconsistency in the size of the workpiece, the failure of the electrodeposition process, and the influence of the bonding force between the coating and the substrate, so as to reduce corrosion, increase concentration, and achieve good wetting effect Effect
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Embodiment 1
[0026] The stainless steel (Cr18Ni9Ti) sheet is composed of NaOH 10g / L, Na 2 CO 3 55g / L, Na 3 PO 4 55g / L, Na 2 SiO 3 Slightly boil in 10g / L lye for 10-15min, wash with distilled water, dry and store in H at a temperature of 30-50°C 2 SO 4 700g / L, HCl 10g / L, HNO 3 Immerse in 500g / L etching solution for 15-30s, take it out and rinse it with distilled water, put it into the trivalent chromium plating solution in Table 1 as the cathode, use the high-purity graphite electrode as the anode, connect the DC power supply, and Adjust the pH to 2.5 at a current density of 20A / m 2 Electroplating under the conditions of 100min. The concrete steps of described etching are: carry out in three times, the first etching adopts the mixed solution etching of 280g / L hydrochloric acid and 180g / L ferric chloride for 10 minutes, the second etching adopts 210g / L hydrochloric acid and The mixed solution of 160g / L ferric chloride is etched for 10 minutes, and the third etching is etched wit...
Embodiment 2
[0032] The stainless steel sheet is composed of NaOH 10g / L, Na 2 CO 3 55g / L, Na 3 PO 4 55g / L, Na 2 SiO 3 Slightly boil in 10g / L lye for 10-15min, wash with distilled water, dry and store in H at a temperature of 30-50°C 2 SO 4 700g / L, HCl 10g / L, HNO 3 Immerse in 500g / L etching solution for 15-30s, take it out and rinse it with distilled water, put it into the trivalent chromium plating solution in Table 1 as the cathode, use the high-purity graphite electrode as the anode, connect the DC power supply, and Adjust the pH to 2.8 at a current density of 16A / m 2 Electroplating under the conditions of 120min.
[0033] The workpiece after electroplating was placed in Na at room temperature 2 CO 3 25g / L, Na 3 PO 4 Immerse in 25g / L water for 3-5 minutes, then clean the surface of the workpiece with water, and dry it to obtain a coating thickness of 8.2μm. The concrete steps of described etching are: carry out in three times, the first etching adopts the mixed soluti...
Embodiment 3
[0035] The stainless steel sheet is composed of NaOH 10g / L, Na 2 CO 3 55g / L, Na 3 PO 4 55g / L, Na 2 SiO 3 Slightly boil in 10g / L lye for 10-15min, wash with distilled water, dry and store in H at a temperature of 30-50°C 2 SO 4 700g / L, HCl 10g / L, HNO 3 Immerse in 500g / L etching solution for 15-30s, take it out and rinse it with distilled water, put it into the trivalent chromium plating solution in Table 1 as the cathode, use the high-purity graphite electrode as the anode, connect the DC power supply, and Adjust the pH to 3.3 at a current density of 24A / m 2 Plating under the conditions of 60min.
[0036] The workpiece after electroplating was placed in Na at room temperature 2 CO 3 25g / L, Na 3 PO 4Immerse in 25g / L water for 3-5 minutes, then clean the surface of the workpiece with water, and dry it to obtain a coating thickness of 3.1μm. The concrete steps of described etching are: carry out in three times, the first etching adopts the mixed solution etching...
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