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Zirconium and zirconium alloy zinc-manganese composite phosphating solution and phosphating method thereof

A technology of zirconium alloy and phosphating liquid, applied in the direction of metal material coating process, etc., can solve the problems of poor corrosion resistance and wear resistance, coarse phosphating film crystals, low phosphating film thickness, etc., to achieve both wear resistance. Excellent, low cost, stable process effect

Inactive Publication Date: 2012-07-11
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is impossible to obtain a good phosphating film on the surface of zirconium and zirconium alloys by using the traditional phosphating processes suitable for iron and steel materials, or the thickness of the obtained phosphating film is low, and the corrosion resistance and wear resistance are poor. Due to the oxide film that is easily formed by zirconium and zirconium alloys in the atmospheric environment
In addition, zirconium metal has strong activity, which is easy to cause substrate corrosion and coarse crystallization of phosphating film.

Method used

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  • Zirconium and zirconium alloy zinc-manganese composite phosphating solution and phosphating method thereof
  • Zirconium and zirconium alloy zinc-manganese composite phosphating solution and phosphating method thereof
  • Zirconium and zirconium alloy zinc-manganese composite phosphating solution and phosphating method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] The zirconium alloy material is a Zr-Al binary alloy with an aluminum content of 8.5% (mass percentage, the same below), which is cut into a 15×25×5mm rectangular sample by wire cutting, and passed through sandpaper of 240, 500, 1000, and 1500 in sequence polished. The composition and process parameters of the zinc-manganese composite phosphating solution involved in the present embodiment are as follows:

[0029] The composition of the pickling solution is as follows: water is used as a solvent, and each liter of pickling solution contains:

[0030] 350ml nitric acid (68%); 50ml hydrofluoric acid (40%).

[0031] The composition of the phosphating solution is as follows: water is used as the solvent, and each liter of the phosphating solution contains:

[0032] 25g orthophosphoric acid, 2.5g zinc oxide, 1.5g manganese nitrate, 2g sodium nitrate, 5g sodium tartrate, 0.1g thiourea, 1.5g NaF, 1g sodium dodecylsulfonate, 10g sodium nitrobenzenesulfonate; The above reagen...

Embodiment 2

[0042] The zirconium alloy material is a Zr-Al binary alloy with an aluminum content of 8.5%, which is cut into a 15×25×5mm rectangular sample by wire, and polished with 240, 500, 1000, and 1500 sandpaper in sequence. The composition and process parameters of the zinc-manganese composite phosphating solution involved in the present embodiment are as follows:

[0043] The composition of the pickling solution is as follows: water is used as a solvent, and each liter of pickling solution contains:

[0044] 400ml nitric acid (68%, mass concentration, the same below); 100ml hydrofluoric acid (40%).

[0045] The composition of the phosphating solution is as follows: water is used as the solvent, and each liter of the phosphating solution contains:

[0046] 20g orthophosphoric acid, 3g zinc nitrate, 3g manganese dihydrogen phosphate, 4g sodium nitrate, 8g sodium citrate, 1g thiourea, 2g NaF, 5g sodium dodecylsulfonate; Mix and dilute to 1 liter.

[0047] The present embodiment zin...

Embodiment 3

[0056]The zirconium alloy material is a Zr-Al binary alloy with an aluminum content of 8.5%, which is cut into a 15×25×5mm rectangular sample by wire, and polished with 240, 500, 1000, and 1500 sandpaper in sequence. The composition and process parameters of the zinc-manganese composite phosphating solution involved in the present embodiment are as follows:

[0057] The composition of the pickling solution is as follows: water is used as a solvent, and each liter of pickling solution contains:

[0058] 450ml nitric acid (68%); 150ml hydrofluoric acid (40%).

[0059] The composition of the phosphating solution is as follows: water is used as the solvent, and each liter of the phosphating solution contains:

[0060] 15g orthophosphoric acid, 5g zinc nitrate, 1g manganese dihydrogen phosphate, 6g sodium nitrate, 10g tartaric acid, 2g thiourea, 1.7g NaF, 1g sodium dodecyl sulfate, 6g sodium dodecylsulfonate; Dissolve each with a small amount of water, then mix and dilute to 1 li...

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Abstract

The invention discloses a zirconium and zirconium alloy zinc-manganese composite phosphating solution and a phosphating method thereof. The zirconium and zirconium alloy zinc-manganese composite phosphating solution is an aqueous solution comprising the following components of: 0.001-10g of zinc salts, 0.001-5g of manganese salts, 5-30g of phosphoric acid, 1-8g of accelerator, 0.001-15g of complexing agent, 0.001-10g of anionic surface agent and 0.001-5g of corrosion inhibitor in each liter of phosphating treatment solution. The phosphating method of the zirconium and zirconium alloy zinc-manganese composite phosphating solution comprises the steps of preliminary grinding, water washing, chemical degreasing, water washing, acid pickling, water washing, phosphating, water washing and drying, wherein the phosphating treatment temperature is 50-90DEG C, the pH value is 1.5-3.5 and the treatment time is 1-30 minutes. According to the zirconium and zirconium alloy zinc-manganese composite phosphating solution and the phosphating method thereof disclosed by the invention, a phosphate conversion coating with favorable protective performance, favorable wear resistance, fineness and uniformity can be obtained from the surfaces of zirconium and zirconium alloy workpieces. The phosphate conversion coating is stable and strong in a binding force and can be used for improving the service performances of zirconium and zirconium alloy and prolonging the service life of the zirconium and zirconium alloy. The phosphating method disclosed by the invention is stable in process, easy to control and is environment-friendly.

Description

technical field [0001] The invention relates to a zirconium and zirconium alloy surface treatment technology, in particular to a zirconium and zirconium alloy phosphating solution and a phosphating method thereof, belonging to the technical field of surface treatment of metal alloy materials. Background technique [0002] In 1824, the Swedish chemist Berzelius first produced metal zirconium with lower purity. In 1925, Dutch scientists Aker and De Boer made ductile bulk metal zirconium. Since then, zirconium has entered people's field of vision and has received more and more attention. Zirconium metal is rich in reserves, has excellent properties such as excellent corrosion resistance and small expansion coefficient, and has been used in many fields such as nuclear industry, electronics industry, chemical industry, jewelry and military. And it has excellent radiation resistance, resistance to atomic oxygen corrosion, resistance to low temperature and alternating temperature ...

Claims

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Application Information

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IPC IPC(8): C23C22/18C23C22/36
Inventor 国栋李强马静毛磊李建辉
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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