Surface phosphating treatment method
In the process of various heat treatment, machining, transportation and storage, the metal appearance is inevitably oxidized, and a thick and uneven oxide layer is generated. Together, it is also simply contaminated with various oils and adsorbs some other impurities.
In the process of various heat treatment, machining, transportation and storage, the metal appearance is inevitably oxidized, and a thick and uneven oxide layer is generated. Together, it is also simply contaminated with various oils and adsorbs some other impurities. For oil stains and certain adsorbates, the thinner oxide layer can be treated with solvent cleaning, chemical treatment and mechanical treatment, or directly by chemical treatment. Regarding the severely oxidized metal appearance, the oxide layer is thick, and it is not possible to directly use solvent cleaning and chemical treatment, and it is preferable to carry out mechanical treatment first. Generally, the metal appearance after disposal is highly active, and it is more easily contaminated by dust, moisture, and the like. For this reason, the metal appearance after disposal should be glued as quickly as possible.
The metal storage period after disposing is as follows:
(1) Aluminum alloy treated by wet blasting, 72h;
(2) steel for sandblasting treatment, 4h;
(3) Anodized aluminum alloy, 30 days;
(4) Stainless steel treated with sulfuric acid, 20 days;
(5) chromic acid-sulfuric acid treated aluminum alloy, 6h;
(6) Brass treated by wet blasting, 8h.
Method for surface phosphating treatment
Aluminum and aluminum alloy appearance disposal methods
[Measure 1]
After degreasing, chemically dispose of in the following solutions:
Concentrated sulfuric acid 27.3 potassium dichromate 7.5 water 65.2
After immersion at 60-65 ° C for 10-30 min, remove it with water, dry it or dry it below 80 ° C; perhaps after washing in the following solution and then drying:
Phosphoric acid 10 n-butanol 3 water 20
This method is suitable for phenolic-nylon glue and so on.
[Measure 2] Degreasing treatment. Wipe with a damp cotton dampening solvent, remove the oil, and then scrub a few times with a cleaned cotton cloth. Commonly used solvents are: trichloroethylene, ethyl acetate, methyl ethyl ketone and gasoline.
[Measure 3]
After degreasing, chemically dispose of in the following solutions:
Phosphoric acid 7.5 Chromium oxide 7.5 Alcohol 5.0 Formaldehyde (36-38%) 80
Immerse at 15-30 ° C for 10-15 min, then wash at 60-80 ° C, boring.
[Measure 4]
After degreasing, anodizing in the following solutions:
Concentrated sulfuric acid 22g/l
Immerse for 10-15 min at a direct current intensity of 1-1.5 A/dm2, then immerse in a saturated potassium dichromate solution at 95-100 ° C for 5-20 min, then wash with water and dry.
[Measure 5]
After degreasing, chemically dispose of in the following solutions:
Ammonium hydrogen fluoride 3-3.5 Chromium oxide 20-26 Sodium phosphate 2-2.5 Concentrated sulfuric acid 50-60
Boric acid 0.4-0.6 water 1000
After immersion at 25-40 ° C for 4.5-6 min, it is washed with water and dried. The method has high bonding strength and is glued within 4 hours after disposal. It is suitable for epoxy glue and epoxy-butyronitrile glue.
[Method 6 After degreasing, chemically dispose in the following solution:
Sodium silicate 10 non-ionic detergent 0.1
Immerse at 65 ° C for 5 min, then wash at 65 ° C or less, then rinse with distilled water and dry. Suitable for bonding aluminum foil.
[Method 7 After sandblasting or sanding, anodize in the following solution:
Chromium oxide 100 sulfuric acid 0.2 sodium chloride 0.2
Increase the voltage from 0 V to 10 V at 40 ° C for 10 min, hold for 20 min, then increase from 10 V to 50 V in 5 min, hold for 5 min, then wash with water and dry at 700 °C. Note: The concentration of free chromium oxide should not exceed 30-35g/l.
[Measure 8
After degreasing, chemically dispose of in the following solutions:
Sodium fluoride 1 concentrated nitric acid 15 water 84
Immerse at room temperature for 1 min, wash with water and then dispose in the following solution:
Concentrated sulfuric acid 30 sodium dichromate 7.5 water 62.5
Immerse for 1 min at room temperature, wash with water, and dry.
Method for surface phosphating treatment
Magnesium and magnesium alloy appearance disposal methods
[Method 1] After degreasing, immerse in the following solution at 70-75 ° C for 5 min:
Sodium hydroxide 12 water 100
Rinse with cold water and immerse in the following solution at 20 ° C for 5 min:
Chromium oxide 10 water 100 anhydrous sodium sulfate 2.8
Rinse with cold water, wash with distilled water, and dry at 40 °C.
[Measure 2] Degreasing treatment. Commonly used solvents are: trichloroethylene, ethyl acetate and methyl ethyl ketone.
[Method 3] Dip in the following solution at 20 ° C for 3 min:
Chromium oxide 16.6 sodium nitrate 20 glacial acetic acid 105 water 100
Wash with cold water, wash with distilled water, and dry at 40 ° C or below.
[Method 4] After degreasing, it was immersed in a 6.3% sodium hydroxide solution at 70 ° C for 10 min, washed with water, and then immersed in the following solution at 55 ° C for 5 min:
Chromium oxide 13.8 calcium sulfate 1.2 water 85
Wash with distilled water and immerse in the following solution at 55 ° C for 3 min:
Chromium oxide 10 sodium sulfate 0.5 water 89.5
After washing with water, it is boring below 60 °C.
[Measure 5]
Immerse in the following solution at 60-70 ° C for 3 min:
Sodium dichromate 10 magnesium sulfate 5 manganese sulfate 5 water 80
Wash with cold water, wash with distilled water, and dry at 70 ° C or less.
[Measure 6
Anodized to a current density of less than 0.45 A/m2 (one electrode panel) in a 10% ammonium hydrogen fluoride solution at 30 ° C or lower, a communication voltage of 90-120 V, then washed with water and boring.
[Measure 7
After degreasing, wash the following lye at 70 ° C for 5-15 min:
Sodium hydroxide 23-34 water 400
Wash with cold water for 5 min, then immerse in the following solution for 5-15 min, temperature 55 ° C:
Chromium oxide 57-68 Calcium nitrate 5 Water 450
Wash with cold water for 2 min, then immerse in the following solution for 3-12 min, temperature 55 ° C:
Chromium oxide 45 sodium phosphate 8 water 450
Wash in cold water for 2 min, then dry at 40 ° C for 30 min.
Method for surface phosphating treatment
Copper and copper alloy appearance disposal methods
[Measure 1]
Immersion in the following solution at 25-30 ° C for 1 min;
Concentrated sulfuric acid 8 concentrated nitric acid 25 water 17
It is then washed with water and dried at 50-60 °C.
[Measure 2]
Immerse in the following solution at 60-70 ° C for 10 min:
Concentrated sulfuric acid 40 iron sulfate 4.5 water 38
It is then washed with water and dried at 60-70 °C.
[Method 3] Common solvents for degreasing: trichloroethylene, methyl ethyl ketone, ethyl acetate.
[Method 4] Sandblasting or sanding cloth is roughened and then degreased.
[Method 5] Dip for 1-2 min at 25-30 ° C in the following solution:
[Measure 6]
Immerse in the following solution at 25-30 ° C for 10-15 min:
Concentrated sulfuric acid 10 sodium dichromate 5 water 85
Then it was washed with water and dried at room temperature.
Ferric chloride 15 concentrated nitric acid 30 water 200
Then it was washed with water and dried at room temperature.
[Method 7] Oxidation in the following solution:
Potassium persulfate 1.5 sodium hydroxide 5 water 100
After immersing at 60-70 ° C for 15-20 min, the appearance is black, and it is scrubbed once with carbon tetrachloride before bonding. This method is used for copper foil disposal.
[Method 8] After degreasing, it was etched in the following solution for 10 min at a temperature of 66-71 ° C:
Iron sulfate 4.5 concentrated sulfuric acid 3.4 water 450
Then wash in cold water at 20 ° C for 5 min, then dip in the following solution:
Sodium dichromate 5 concentrated sulfuric acid 10 water 85
Then, it was washed in cold water, immersed in ammonium hydroxide (d=0.85) for 10 min, washed with cold water for 5 min, washed with distilled water, and dried at 40 °C. This method is used for brass and bronze disposal.
[Article source: Hefei Xianghe Phosphate Coatings Co., Ltd. http://, please indicate the source! 】
N-Methylimidazolium Chloride,N-Methylimidazolium Chloride 99%,N-Methylimidazolium Chloride In Stock,Imidazole Ionic Liquids
Henan Tianfu Chemical Co.,Ltd , http://www.tianfuchem.com