US 12,331,422 B2
Titanium surface treatment method
Guo Tie Long, Shenzhen (CN); and Tan Yonggang, Shenzhen (CN)
Assigned to DONGGUAN DSP TECHNOLOGY CO., LTD., Dongguan (CN)
Filed by DONGGUAN DSP TECHNOLOGY CO., LTD., Dongguan (CN)
Filed on Nov. 14, 2022, as Appl. No. 18/055,144.
Claims priority of application No. 2021-186704 (JP), filed on Nov. 16, 2021.
Prior Publication US 2023/0151506 A1, May 18, 2023
Int. Cl. C23F 17/00 (2006.01); C23F 1/26 (2006.01); C25D 5/38 (2006.01); C25D 9/02 (2006.01)
CPC C25D 9/02 (2013.01) [C23F 1/26 (2013.01); C23F 17/00 (2013.01); C25D 5/38 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A titanium surface treatment method for bonding with a polymer composite which comprises:
(a) a first etching step wherein the titanium surface is etched by acidic solution;
(b) a first surface treatment step wherein the titanium surface is treated by ultrasonic wave;
(c) a second etching step wherein the titanium surface is etched again by acidic solution;
(d) a second surface treatment step wherein the titanium surface is treated again by ultrasonic wave;
(e) a first silane coupling treatment step wherein the titanium surface is treated by ultrasonic wave;
(f) a third surface treatment step wherein the titanium surface is treated again by ultrasonic wave; and
(g) a second silane coupling treatment step wherein the titanium surface is treated by anodic oxidation;
wherein the first silane coupling treatment step (e) is performed
in a first silane coupling solution containing
10-50 wt % of NaOH, Na2CO3 and NH4NO3,
mixed at a weight ratio of 3:1:1 and
a first silane coupling agent
at a concentration of 0.1-1 wt %,
wherein the first silane coupling treatment step (e) performs ultrasonic wave for 10-300 seconds at a frequency of 24-100 kHz, at 30-70° C. and at an output of 400 W,
wherein the second silane coupling treatment step (g) is performed in a second silane coupling solution containing 10-50 wt % of
NaOH, KOH, Ca(OH)2 and NaHCO3, that are mixed at a weight ratio of 3:1:1:1, and
a second silane coupling agent at a concentration of 0.1-1 wt %, wherein the second silane coupling treatment step (g) performs the anodic oxidation for 1 to 30 minutes at a current density of 0.1 to 10 A/dm2 using a rectifier for a positive 1 Hz pulse current with durations of 500 ms at 30 to 70° C.