Surface treatment methods for titanium and titanium alloys

[Method 1]

Common solvents for degreasing: trichloroethylene, acetone, butanone, benzene, ethyl acetate, gasoline, anhydrous ethanol.

[Method 2]

After degreasing, immerse in the following solution at 20 ° C for 5-10 minutes:

Sodium fluoride, 2 chromium oxide, 1 sulfuric acid (d=1.84), 10 water, 50

Rinse with water, wash with distilled water, and dry at 93 ° C.

[Method 3]

Treat at 20 ° C for 2 minutes in the following solution:

Hydrofluoric acid (concentrated) 84 hydrochloric acid (37%) 8.9 phosphoric acid (85%) 4.3

Rinse with water, rinse with distilled water, and dry at 93 ° C.

[Method 4]

After degreasing, wash with alkaline aqueous solution, and then treat at room temperature for 4-6 minutes in the following solution:

Nitric acid (70%) 5 ammonium fluoride 3 water 92

After washing with water, treat at room temperature for 2 minutes in the following solution:

Trisodium phosphate 5 sodium fluoride 1 hydrofluoric acid 1.5 water 92.5

Dry after washing with water.

[Method 5]

After degreasing, scrub with the following solution for 2-3 minutes:

Trisodium phosphate 5 sodium fluoride 1.3 hydrofluoric acid 2.9 water 90.8