Method for preparing nichrome composite coating in environment-friendly trivalent chromium plating solution
A nickel-chromium alloy and composite coating technology, which is applied in the field of preparing nickel-chromium alloy composite coatings in an environment-friendly trivalent chromium plating solution, can solve the problems of not mentioning the beautiful decoration and corrosion resistance of the coating, and the low thickness of the coating, and achieve Easy to operate, continuous and uniform plating effect
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Embodiment 1
[0040] (1) Prepare the electroplating solution in the electroplating tank, the content is as follows:
[0041] CrCl 3 ·6H 2 O: 75g / L, NiSO 4 ·6H 2 O: 50g / L, NiCl 2 ·6H 2 O: 45g / L, NH 4 C1: 50g / L, KBr: 12.5g / L, H 3 BO 3 : 50g / L, sodium citrate: 130g / L, sodium formate: 62.5g / L, urea: 62.5g / L, sodium lauryl sulfate: 0.2g / L.
[0042] (2) Electroplating conditions:
[0043] The temperature is 25°C and the current density is 25A / dm 2 , the stirring method is mechanical stirring and the rotation speed is 100r / min, and the pH value of the plating solution is adjusted with hydrochloric acid or sulfuric acid and sodium hydroxide or ammonium sulfate.
[0044] (3) The anode is made of a carbon rod with a diameter of 8mm. Before electroplating, it is smoothed with sandpaper, rinsed with distilled water to remove surface impurities, and dried before use. The cathode is made of copper sheet, and its specification is 20mm×10mm×0.5mm, so that the ratio of the area of the cathode t...
Embodiment 2
[0048] (1) The anode is a carbon rod with a diameter of 8 mm. Before electroplating, it is polished with sandpaper, rinsed with distilled water to remove surface impurities, and dried before use.
[0049] (2) The cathode is made of copper sheet, and its specification is 20mm×10mm×0.5mm, so that the ratio of the area of the cathode to the anode is kept at S 阳 : S 阴 =1.4:1 or so. The cathode treatment process is: single-sided copper sheet → 200-mesh water sandpaper grinding → 600-mesh water sandpaper grinding to smooth and bright → alkali washing and degreasing → water washing → drying → weighing → activation → electroplating → take out the plated parts after the specified time.
[0050] (3) Constant temperature water bath 25 ℃, adjust the pH=2.50 of plating solution among the embodiment 1, the mechanical stirring speed is 100r / min, and the direct current electroplating current density is 25A / dm 2 , DC electroplating for 4 hours, you can get a bright, uniform nickel-chromium...
Embodiment 3
[0053] (1) Prepare the electroplating solution in the electroplating tank, CrCl 3 ·6H 2 O is 78g / L, and other components and content are with embodiment 1.
[0054] (2) electroplating condition: with embodiment 1.
[0055] (3) The anode is made of a carbon rod with a diameter of 8mm. Before electroplating, it is smoothed with sandpaper, rinsed with distilled water to remove surface impurities, and dried before use. The cathode is made of copper sheet, and its specification is 20mm×10mm×0.5mm, so that the ratio of the area of the cathode to the anode is kept at S 阳 : S 阴 =1.4:1 or so. The cathode treatment process is: single-sided copper sheet → 200-mesh water sandpaper grinding → 600-mesh water sandpaper grinding to smooth and bright → alkali washing and degreasing → water washing → drying → weighing → activation → electroplating → take out the plated parts after the specified time.
[0056] (4) Constant temperature water bath at 25°C, adjust pH=2.50, mechanical stirrin...
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