Cathode shielding preparation method for super-thick open-hole foam iron-nickel filter material

Abstract

The invention discloses a cathode shielding preparation method for a super-thick open-hole foam iron-nickel filter material. According to the method, a foam through-hole sponge is coated with conductive graphite glue or subjected to chemical nickel-plating to serve as an electroplating cathode, a pure iron plate or an alloy plate with a certain proportion of iron and nickel is adopted as an anode, and the cathode, the anode and a cathode shielding plate are put into an electroplating solution with ferrous chloride as main salt or ferrous chloride and nickelous chloride as main salt for electroplating; a semi-finished product is subjected to heat treatment under the reducing atmosphere / inert gas shielding; and the finished product is cut according to the technical requirements. Compared with the prior art, by means of the method, the good deep plating and even-plating are achieved, and the super-thick open-hole foam iron-nickel filter material which is good in permeability, high in filtering efficiency and low in cost is formed, the content of impurities is reduced by over 20%, detection is conducted according to an HJ / T762-2001 test method, the removal rate generated when the method is applied to foam iron-nickel lampblack ranges from 85% to 94%, the wind speed is 1.2 m / s, the pressure loss is less than 20 pa, the economic benefits are increased remarkably, and the method has the great market popularization value.

Description

technical field [0001] The invention relates to the technical field of an ultra-thick open-cell foamed iron-nickel filter material, in particular to an electrodeposition preparation method for cathode shielding, which is applied to industrial dust, oil smoke and oil mist, metal casting, and air purification and filtration. Background technique [0002] At present, the filter materials used in the fields of industrial dust, oil fume and oil mist, metal casting, and air purification and filtration are mainly wire mesh, fiber felt or porous ceramics, which often have the problem that filtration efficiency and fluid permeability cannot be optimized at the same time, while foam ceramics and Although conventional nickel foam materials have a three-dimensional high-permeability open-pore structure, the former mostly adopts slurry casting with low porosity, while the latter is mainly thin metal foam for batteries (thickness is generally within 2 mm), and the filtration efficiency lo...

AI Technical Summary

Problems solved by technology

[0002] At present, the filter materials used in the fields of industrial dust, oil fume and oil mist, metal casting, and air purification and filtration are mainly wire mesh, fiber felt or porous ceramics. Most of them have the problem that the filtration efficiency and fluid permeability cannot be optimized at the same time, while foam ceramics and Although conventional nickel foam materials have a three-dimensional high-permeability open-pore structure, the former is mostly cast with a low porosity, and the latter is mainly thin metal foam for batteries (thickness is generally within 2 mm). low, limited range of application

Japanese patent 3303395B2 has been able to prepare foamed nickel metal materials of more than 10 mm, which are mainly used for kitchen oil fume filtration, but the cost of pure nickel metal is high, the texture is soft, and the process requires a specific gravity close to 0.7g / cm3 in order to maintain the mechanical properties of the material. Strength, which makes the cost of the filter higher

If the preparation process can be improved and large-scale mass production of low-cost, high-strength open-cell metal foam mainly made of iron will undoubtedly have good market expectations. However, the current preparation of ultra-thick foamed iron-nickel electrodeposition method lies in its deep plating and dispersion. The ability is poor, the coating is uneven and easy to corrode, resulting in impermeable plating, high brittleness, and poor strength. As a result, the product qualification rate is low and it is difficult to mass produce