Yellow chrome-free composite conversion coating treatment solution on surface of aluminum or aluminum alloy and method for preparing conversion coating from yellow chrome-free composite conversion coating treatment solution
A technology of aluminum alloy surface and conversion coating, applied in the direction of metal material coating process, etc., can solve the problems of cumbersome process, poor application effect, complex composition, etc., and achieve the effect of uniform color, good corrosion resistance and low concentration
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Embodiment 1
[0051] ⅰ, the preparation of organic additive a:
[0052] Add 25.8g of diethylenetriamine, 7.5g of paraformaldehyde and 5.0g of ethanol into a four-necked round-bottomed flask equipped with a stirring rod, condensing device and nitrogen, and stir at 25°C for 1 hour, then add 16.5g of ortho Hydroquinone, raise the temperature to 35°C and react for 6 hours. Add 65.7 g of 40% fluotitanic acid solution to the reaction product, and stir at room temperature for 1 hour to obtain a reddish-brown water-soluble organic additive a for use.
[0053] After testing, the infrared spectrum of the above-mentioned prepared organic additive a is as follows: figure 1 , 3596 cm -1 ~3300cm -1 The strong and broad absorption peak is mainly the O-H stretching vibration peak at 3500 cm -1 ~3300 cm -1 The strong absorption peak at is mainly the N-H stretching vibration peak, at 3000 cm -1 ~2800 cm -1 The strong absorption peak at is the CH on the aromatic ring 2 Stretching vibration peak, 1610 ...
Embodiment 2
[0078] a. Preparation of chromium-free yellow compound conversion coating treatment solution on aluminum surface:
[0079] Weigh 8.0 g of the organic additive a prepared in Example 1-i, 3.5 g of nitric acid (65% to 68% in mass concentration), 1.6 g of boric acid, and 1.2 g of fluoboric acid, add deionized water to dissolve and mix, and then weigh ammonia water (Mass concentration is 25%~28%) 2.4g, mix evenly, dilute to 1L with deionized water, and obtain yellow transparent treatment liquid product (Ⅱ), specific gravity is 1.05g / cm 3 .
[0080] Weigh 50g of the above-mentioned treatment solution (II) and dilute it to 1000mL, adjust the pH value to 5.0, which is the treatment solution for the chromium-free yellow composite conversion coating on the aluminum surface.
[0081] b. Method for preparing conversion coating with chromium-free yellow composite conversion coating treatment solution on aluminum surface:
[0082] Firstly, treat the 6063 aluminum profile test piece in Kef...
Embodiment 3
[0086] 1, the preparation of organic additive b:
[0087] Add 36.6g of triethylenetetramine, 24g of furfural and 9.0g of ethanol into a four-neck round-bottomed flask equipped with a stirring rod, condensing device and nitrogen gas, stir at 25°C for 1 hour, add 18.5g of resorcinol, The temperature was raised to 35°C to continue the reaction for 6 hours. Add 106 g of 40% fluotitanic acid solution to the product, stir at room temperature for 1 hour, and stop the reaction to obtain a reddish-brown water-soluble organic additive b for use.
[0088] ⅱ. Preparation of chromium-free yellow composite conversion coating treatment solution on aluminum alloy surface:
[0089] Weigh 9.5g of the organic additive b prepared in Example 3-i, 5.0g of nitric acid (65%-68% in mass concentration), 1.5g of sodium fluoride, and 1.0g of boric acid, add a small amount of deionized water to dissolve and mix, and then weigh Take 3.5 g of ammonia water (mass concentration is 25% to 28%), mix well, and...
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