Film formation solution of chromium- and crack-free magnesium alloy conversion film and film layer preparation method
A magnesium alloy and conversion coating technology, applied in the direction of metal material coating process, can solve the problems of carcinogenicity limitation, inability to form film, unfavorable corrosion resistance, etc., and achieve the advantages of simple process flow, energy saving, and improved corrosion resistance. Effect
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Embodiment 1
[0031] Sample: cast AZ91D magnesium alloy after grinding with 2000# sandpaper;
[0032] Dimensions: 50mm×50mm×10mm, a hole is punched in the upper left corner for easy hanging.
[0033] In this embodiment, the preparation method of the chromium-free and crack-free conversion film is processed according to the following process flow:
[0034] (1) Degreasing and degreasing
[0035] The surface mechanically polished AZ91D magnesium alloy sample was suspended in an acetone solution and ultrasonically cleaned at room temperature for 1 minute, and the degreased sample was cleaned with flowing deionized water for 1 minute.
[0036] (2) Film formation
[0037] Suspend the degreased AZ91D magnesium alloy sample in the film-forming solution at 30°C for 30 minutes. The film-forming solution used is composed of: sodium dihydrogen phosphate 30g / L, disodium hydrogen phosphate 2g / L, phosphoric acid 1ml / L , sodium fluoride 5g / L, sodium nitrate 10g / L, potassium fluotitanate 1g / L, zirconium ...
Embodiment 2
[0042] Sample: cast ZM6 magnesium alloy after grinding with 2000# sandpaper;
[0043] Dimensions: 50mm×50mm×10mm, a hole is punched in the upper left corner for easy hanging.
[0044] In this embodiment, the preparation method of the chromium-free and crack-free conversion film is processed according to the following process flow:
[0045] (1) Degreasing and degreasing
[0046] The surface mechanically polished ZM6 magnesium alloy sample was suspended in an alcohol solution and ultrasonically cleaned at room temperature for 3 minutes, and the degreased sample was cleaned with flowing deionized water for 2 minutes.
[0047] (2) Film formation
[0048] Suspend the degreased and deoiled ZM6 magnesium alloy sample in a film-forming solution at 25°C for 20 minutes. The film-forming solution used is composed of: 20 g / L ammonium dihydrogen phosphate, 15 g / L sodium carbonate, 5 g / L boric acid, 0.5ml / L, ammonium bifluoride 15g / L, potassium nitrate 8g / L, ammonium fluorozirconate 1.5g...
Embodiment 3
[0053] Sample: rolled AZ31B magnesium alloy after grinding with 2000# sandpaper;
[0054] Dimensions: 50mm×50mm×10mm, a hole is punched in the upper left corner for easy hanging.
[0055] In this embodiment, the preparation method of the chromium-free and crack-free conversion film is processed according to the following process flow:
[0056] (1) Degreasing and degreasing
[0057] The surface mechanically polished AZ31B magnesium alloy sample was suspended in an alkaline solution and ultrasonically cleaned at room temperature for 5 minutes, and the degreased sample was cleaned with flowing deionized water for 0.5 minutes.
[0058] Wherein, the alkaline solution is a mixed aqueous solution of sodium hydroxide, sodium carbonate, sodium phosphate, sodium silicate, and sodium dodecylbenzenesulfonate, and the concentration range of each component is: sodium hydroxide 15g / L, sodium carbonate 20g / L, sodium phosphate 30g / L, sodium silicate 5g / L, sodium dodecylbenzenesulfonate 3g / L...
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Abstract
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