A kind of electroplating pretreatment method for carbon steel bolts
A technology for electroplating pretreatment and bolts, which is used in the pretreatment of carbon steel bolt surfaces and in the field of electroplating work pretreatment, which can solve the problems that the surface oxide layer is difficult to effectively remove, the adhesion strength of the electroplating layer is poor, and the surface of the workpiece is smooth and beautiful. , The effect of high binding force and high economic efficiency
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Embodiment 1
[0038] Take the carbon steel bolts to be treated and put them into the electrolyte, turn on the electricity and electrolyze, and degrease and degrease the carbon steel bolt matrix. Then, put the degreased carbon steel bolts into dilute hydrochloric acid, and pickle to remove the oxides on the surface of the bolt matrix. After pickling, put it in ethanol, ultrasonically clean it, and dry it. The Lewis acid solution prepared by aluminum oxide and disubstituted imidazole chloride with a molar ratio of 1.5:1 is used as the activation solution, the carbon steel bolt workpiece is used as the anode, and the aluminum plate is used as the cathode. 2 The current density is used for activation, and the activation time is 6 minutes.
[0039] Further, during the activation process, the activation solution is stirred to promote the disturbance of the ionic liquid on the surface of the workpiece, so that the oxide layer is completely removed during the anodic activation process, and the sti...
Embodiment 2
[0041] Put the carbon steel bolts to be treated into the electrolyte solution: sodium hydroxide 40g / L, sodium carbonate 30g / L, trisodium phosphate 15g / L. , heated to 60°C, energized and electrolyzed for 1 minute, current density 5 mA / cm 2 , Degreasing and degreasing. Then, put the degreased carbon steel bolts into dilute nitric acid, soak and pickle for 30 seconds to remove the oxides on the surface. After pickling, put it into propanol, set the ultrasonic instrument to 100W, ultrasonically clean for 15min, and dry. The ionic liquid of aluminum oxide and disubstituted imidazolium chloride with a molar ratio of 2:1 is used as the activation solution, the carbon steel bolt workpiece is used as the anode, and the Al plate is used as the cathode. 2 The current density is used for activation, and the activation time is 8 minutes.
Embodiment 3
[0043] This embodiment is used to illustrate the electroplating pretreatment method for carbon steel bolts provided by the present invention.
[0044] The experimental material is Q235 carbon steel bolts, and the specific operation steps are as follows:
[0045] (1) One step degreasing
[0046] The degreasing liquid formula is: sodium hydroxide 30g / L, sodium carbonate 30g / L, trisodium phosphate 5 g / L and the balance deionized water. Except for ionized water, other components are dissolved in deionized water according to the proportion of the formula, and mixed to obtain an aqueous solution, which is put into a tank for use. Put the Q235 carbon steel bolt workpiece as the cathode, and the 304 stainless steel plate as the anode, put it into the electrolyte at a temperature of 60°C, apply a current density of 5mA / cm2, and electrolytically degrease for 1min.
[0047] (2) pickling
[0048] Pickling solution formula: 5% dilute hydrochloric acid. Immerse the electrolytically degr...
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Abstract
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