Large-depth-diameter-ratio tiny hole inner hole deposition technology
A technology with fine pores and depth-to-diameter ratio, applied in electrolytic coatings, coatings, etc., can solve problems such as inability to plate into the coating, poor signal transmission, oxidation blackening, etc., to improve deep plating ability, meet coating requirements, and coating crystal fine effect
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Embodiment 1
[0020] A technique for depositing micropores and inner pores with a large depth-to-diameter ratio, comprising the following steps:
[0021] S1. Before electroplating, the prepared composite electroplating solution is subjected to low-current activated carbon adsorption and electrolytic removal of impurities;
[0022] S2. Stabilize the PH value of the composite electroplating solution between 4, the concentration of nano slurry is 150g / L, the main salt is nickel sulfamate 450g / L, and then electroplating is performed, and the electrolytic nickel plate is used as the anode after surface treatment, and the stainless steel plate After the surface treatment, it is used as the cathode, and the nanocrystalline coating is electroplated by a single pulse electrodeposition process, wherein the electrodeposition time is 3h, and the pulse current density is 7.0A / dm 2 , the duty cycle is 55%, the period is 1ms, the electrodeposition temperature is 55°C, the stirring speed is 400r / min, and t...
Embodiment 2
[0028] Embodiment 2: This embodiment is based on Embodiment 1, but the difference is that the pulse current density in S2 is changed, and the pulse current density range is 2-14A / dm 2 , the coating microhardness HV is as follows figure 1 shown;
[0029] Such as figure 1 As shown, as the pulse average current density increases, the microhardness first increases and then decreases, with a maximum of 425HV; when the average current density is low, the lower cathode overpotential limits the formation rate and growth rate of crystal nuclei; at the same time , the co-deposition process is slow, the amount of nanoparticles coated and embedded by the matrix metal is small, and the strengthening effect is relatively weak; these two reasons together lead to the formation of coarse grains and loose structures, making the microhardness lower . When the average current density increases, the strong electrostatic attraction and the force between the two-phase interface promote more nanop...
Embodiment 3
[0030] Embodiment 3: This embodiment is based on Embodiment 1, but the difference is that the duty cycle in S2 is changed, the duty cycle range is 0.2-1.0, and the coating microhardness HV is as follows figure 2 shown;
[0031] The relationship between the pulse duty cycle and the microhardness of the coating is as follows: figure 2 shown, with figure 1 It can be seen from the comparison that the changing trend presented is similar to that, and the microhardness increases first and then decreases with the increase of duty cycle. Analyzing the reasons, this change is mainly attributed to the fact that the change of duty cycle affects the crystallization process and the composite amount of nanoparticles in the composite coating, which in turn affects the strengthening effect of the particles and the compactness of the composite coating. The duty cycle is small, the conduction time is short, and the rest time is long. The ions consumed during the rest period can be effectivel...
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