Praseodymium Sulfate Hydrate CAS 10277-44-8

The composition of the passivation solution is: cerium chloride 6-8g/L, lanthanum nitrate 1-3g/L, praseodymium sulfate 2-4g/L, potassium permanganate 8-10g/L, ferrous chloride 12-14g /L, potassium ferrate 3-5g/L, calcium nitrate 1.5-2.5g/L, sodium citrate 6-8g/L, water-based polyurethane 60-66g/L, m-xylylenediamine 6-8g/L, times Nitrotrimethylene triphosphonic acid 7-9g/L, sodium dodecylbenzenesulfonate 1-3g/L, and the balance is deionized water.

The passivation solution is specially designed for the characteristics of aluminum alloys used in aviation. It is chromium-free and fluorine-free, and is environmentally friendly. The addition of complex rare earth salts improves the corrosion resistance of the passivation film, and the passivation solution is stabilized by adding potassium ferrate. Waterborne polyurethane and nitrilotrimethylenetriphosphonic acid improve film formation. Therefore, the corrosion resistance of the passivation film prepared by the passivation solution of the present invention is good.

The catalyst is composed of magnesium-calcium-aluminum composite oxide and praseodymium sulfate, and the molar ratio of each component in terms of metal elements is: Mg/Al is 1:1~3:1, Mg/Ca is 5:1~20 :1, Mg/Pr is 10:1~40:1. The preparation method is as follows: preparing magnesium-calcium-aluminum composite oxide by co-precipitation method, spraying and immersing the magnesium-calcium-aluminum composite oxide with praseodymium sulfate solution, drying and roasting to obtain a finished catalyst. When the catalyst improves the selectivity of the target product isophorone, the yield of the product isophorone is improved.

The method comprises the following steps, 1) glass fiber pretreatment; 2) nickel chloride, cobalt chloride, praseodymium sulfate, sodium borohydride, sodium potassium tartrate, sodium metabisulfite and ethylenediamine are dissolved in distilled water respectively; 3) step 2 ) in the fully dissolved nickel chloride, cobalt chloride, praseodymium sulfate, sodium metabisulfite and ethylenediamine solution mixed evenly, then added to the sodium potassium tartrate solution, stirred evenly; 4) sodium borohydride solution was slowly added to step (2 ) the prepared solution, dilute, and adjust the pH value to 11 to 14 with sodium hydroxide; 5) join the glass fiber after pretreatment in step 1) to the plating solution prepared in step 3) to perform electroless tin-nickel plating , the plating temperature is 55-90° C.; 6) drying the Ni-Co-Pr-B glass fiber prepared in step 5).

The Ni-Co-Pr-B glass fiber coating prepared by adopting the technical scheme has high nickel content, good coating binding force, good conductivity and stability.