Magnesium alloy surface zinc-calcium series phosphating solution and conversion treatment process thereof
一种镁合金、溶液的技术,应用在镁合金表面锌钙系磷化溶液及其转化处理工艺领域,能够解决成本高、保护膜附着力不强、操作不容易等问题,达到成本低、保护性良好、操作简单易控制的效果
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Embodiment 1
[0027] Example 1: Each liter of aqueous solution contains 15 grams of disodium hydrogen phosphate, 4 grams of zinc nitrate, 2 grams of sodium nitrite, 0.5 grams of sodium fluoride, and 0.5 grams of calcium nitrate; the pH of the phosphating solution is 2, using phosphoric acid And / or sodium hydroxide to adjust the pH.
[0028] The surface of the magnesium alloy sample is degreased and the oxide scale is removed (surface activation treatment), then washed with water, and then immersed in the above-prepared phosphating solution adjusted to pH 2.5 with phosphoric acid and / or sodium hydroxide at 50°C Let stand for 20 minutes, then wash and dry. The film layer obtained by the present invention is black, and the corrosion current density of the conversion film layer obtained on the surface of the extruded AZ31 in 3.5% NaCl solution is 23 μA / cm 2 about. The SEM photo of the phosphating film obtained in this example is attached figure 1 And the composition analysis of the film is attach...
Embodiment 2
[0030] Example 2: Each liter of aqueous solution contains 20 grams of disodium hydrogen phosphate, 5 grams of zinc nitrate, 3 grams of sodium nitrite, 1 gram of sodium fluoride, and 1 gram of calcium nitrate; the pH value of the phosphating solution is 2.5.
Embodiment 3
[0031] Example 3: Each liter of aqueous solution contains 30 grams of disodium hydrogen phosphate, 6 grams of zinc nitrate, 4 grams of sodium nitrite, 2 grams of sodium fluoride, and 2 grams of calcium nitrate; the pH of the phosphating solution is 3.
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