Magnesium and magnesium alloy surface treatment method
June 27, 2024
[ Method 1] Degreasing treatment. Commonly used solvents are: trichloroethylene, acetone, ethyl acetate and methyl ethyl ketone.
[ Method 2] After degreasing, in the following solution at 70 -75 °C Immersion for 5 min : sodium hydroxide 12 water 100 rinsed with cold water and then in the following solution 20 ° C Dipping 5min: chromium oxide 10 100 over anhydrous sodium sulfate 2.8 Water rinse with cold water, then washed with distilled water, the 40 ° C dry.
[ Method 3] After degreasing, in 6.3% sodium hydroxide solution 70 ° C After immersing for 10 min , washing with water, and then in the following solution 55 ° C Immersion for 5 min : chromium oxide 13.8 calcium sulfate 1.2 water 85 washed with distilled water, and then in the following solution 55 ° C Immersion for 3 min : chromium oxide 10 sodium sulfate 0.5 water 89.5 after washing with water 60 ° C Dry below.
[ Method 4] in the following solution 20 ° C Immersion for 3 min : chromium oxide 16.6 sodium nitrate 20 glacial acetic acid 105 water 100 rinsed with cold water, washed with distilled water, at 40 ° C Dry below
[ Method 5] in the following solution at 60 -70 °C Dipping 3min: Sodium dichromate, manganese sulfate 10 5 5 Magnesium sulfate 80 water rinse with cold water, distilled water, in 70 ° C Dry below.
[ Method 6] After degreasing, it was immersed in the following boiling solution for 20 minutes : sodium dichromate 1.5 ammonium sulfate 3 ammonia water (d = 0.88) 0.3 water 93.7 was rinsed with warm water, washed with distilled water, and dried.
[ Method 7] In 30 ° C The following ammonium hydride ammonium 10% solution is anodized to a current density lower than 0.45A /m2 (one electrode panel), AC voltage 90-120V , then washed with water and dried.
[ Method 8] at 20 -30 °C Following anodization solution: potassium aluminum 12 0.75 3.4 sodium phosphate, potassium fluoride, anhydrous potassium permanganate 3.4 1.5 water 80 AC voltage 85V , current density 1.1 -1.4A /m2 , then washed with cold distilled water and dried.
[ Method 9] After degreasing 70 ° C Wash the following lye for 5-15min : sodium hydroxide 23-34 water 400 is washed with cold water for 5min , then immersed in the following solution for 5-15min , temperature 55 ° C : chrome oxide 57-68 calcium nitrate 5 water 450 washed with cold water for 2min , and then immersed in the following solution for 3-12min , temperature 55 ° C : chrome oxide 45 sodium phosphate 8 water 450 washed in cold water for 2min , then 40 ° C Dry for 30 min .
