Lead dioxide electrode and preparation process thereof of aluminum alloy surface ceramic-coating
A technology of aluminum alloy surface and lead dioxide, which is applied in the direction of electrodes, electrolysis process, electrolysis components, etc., to achieve the effect of light weight, large surface area and high corrosion resistance
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Embodiment 1
[0034] Embodiment 1: The composition and content of PECC electrolyte are as follows: sodium hypophosphite 10g / L, sodium aluminate 50g / L, sodium polyphosphate 50g / L, trisodium phosphate 50g / L, sodium tungstate 5g / L , sodium silicate 40g / L, sodium stannate 25g / L, glycerol 50g / L, current density 0.5A / dm 2 , Arc discharge voltage 100 ~ 200V. Coating process of tin antimony oxide coating: on this aluminum alloy ceramic sheet, SnCl 4 4H 2 O and SbCl 3 ·H 2 O, according to the mass ratio of 0.5, it was formulated as n-butanol hydrochloric acid solution, slowly covered on the surface of the electrode and then dried, repeated several times, and then thermally decomposed at 450 ° C, and then washed and dried. Preparation of lead dioxide electrode: (a) lead dioxide electroless plating. Plating solution formula: Pb(NO 3 ) 2 , 0.5mol / L; NH 4 Ac 1mol / L, (NH 4 ) 2 S 2 o 4 1mol / L, pH 7, temperature 40°C. (b) Electroplating α-PbO 2 . With 190g / L PbO, 20g / L HNO 3 , 60g / L glacial...
Embodiment 2
[0035] Embodiment 2: The component and content of PECC electrolytic solution are as follows: sodium aluminate 80g / L, sodium polyphosphate 100g / L, trisodium phosphate 50g / L, sodium tungstate 10g / L, sodium silicate 80g / L, Sodium hypophosphite 100g / L, tartaric acid 100g / L. Current density 1A / dm 2 , Arc discharge voltage 100 ~ 300V. Coating process of tin antimony oxide coating: on this aluminum alloy ceramic sheet, SnCl 4 4H 2 O and SbCl 3 ·H 2 O, according to the mass ratio of 1.0, it was formulated as n-butanol hydrochloric acid solution, slowly covered on the surface of the electrode, and then dried, repeated several times, and then thermally decomposed at 450 ° C, and then washed and dried. The preparation of the lead dioxide electrode is the same as in Example 1.
Embodiment 3
[0036] Embodiment 3: The composition and content of PECC electrolyte are as follows: sodium hypophosphite 100g / L, sodium aluminate 40g / L, sodium polyphosphate 20g / L, sodium tungstate 2g / L, sodium silicate 6g / L , Glycerol 100g / L. Sodium stannate 50g / L, current density 3A / dm 2 , Arc discharge voltage 100 ~ 380V. Coating process of tin antimony oxide coating: on this aluminum alloy ceramic sheet, SnCl 4 4H 2 O and SbCl 3 ·H 2 O, according to the mass ratio of 2.0, it was prepared as n-butanol hydrochloric acid solution, slowly covered the surface of the electrode and then dried, repeated several times, and then thermally decomposed at 450 ° C, and then washed and dried. The preparation of the lead dioxide electrode is the same as in Example 1.
[0037] The specific operation method is as follows: pretreatment of aluminum alloy→water washing→PECC treatment→water washing→coating tin dioxide and antimony trioxide composite coating→electroless lead dioxide plating→electroplatin...
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