Surface treatment method of carbon steel and ferroalloy

Surface treatment method of carbon steel and ferroalloy
Method 1] Common solvents for degreasing: trichloroethylene, acetone, ethyl acetate, gasoline, benzene, absolute ethanol.
[Method 2] Degreasing after sandblasting or sanding.
[Method 3] Soak in a 10% water glass aqueous solution at 60% 26deg; C for 10-15 minutes, then wash with water and dry.
[Method 4] Immerse in 18% hydrochloric acid aqueous solution at room temperature for 5-10 minutes, rinse with cold water, rinse with distilled water, and dry at 93% 26deg; C for 10 minutes. [Method 5] Treat the mixture with the same amount of concentrated phosphoric acid and formaldehyde at 60% 26deg; C for 10 minutes, then wash with water and dry.
[Method 6] After degreasing, soak in a 3.5% sodium hydroxide solution at 60% 26deg; C for 20 minutes, rinse with cold water, then actuate in 5% nitric acid solution for 10 minutes, rinse with cold water, and then immerse In the solution: sodium dichromate 7.5 sulfuric acid 24 water 7765% 26deg; after immersing at C for 20 minutes, wash with 60% 26deg; C hot water, then wash with cold water, and dry at 70% 26deg; C.
[Method 7] Soak in 71-77%26deg; C for 10min in the following solution: sodium dichromate 4 sulfuric acid (d=1.84) 10 water 30 washed with water, washed with distilled water, and dried at 93% 26deg; C.
[Method 8] Dipping in the following solution at 60-65% 26deg; C for 5 min: Sodium silicate 30 alkyl aryl sulfonate 3 water 967 washed with water, washed with hot distilled water, and dried at 100-105% 26deg; C .
[Method 9] Immerse in the following solution at 60% 26deg; C for 10 minutes: phosphoric acid (88%) 10 ethanol 20 washed with running water to remove the carbon residue, washed with distilled water, and dried at 120% 26deg; C for 30 minutes.