Titanium anode base material pretreatment method

Abstract

The invention discloses a titanium anode base material pretreatment method. The method comprises the following steps: selecting a titanium material; the titanium material is subjected to surface heat treatment and recrystallization annealing, the heat treatment temperature is 650-680 DEG C, and furnace cooling is carried out after heat preservation is carried out for 2-3 h; the electrolyte comprises the following components: 1 mol / L to 1.05 mol / L of NH4Br, 0.1 mol / L to 0.15 mol / L of NaF, 0.05 mol / L to 0.06 mol / L of HCL and 2 ppm to 5 ppm of polyethylene glycol-2000, the pH value of the electrolyte is equal to 3, and the temperature is 25 DEG C to 30 DEG C; according to the electrolysis process, the current density is 50-80 A / m < 2 >, and the electrolysis time is 60-120 min; and performing ultrasonic oscillation on the titanium material subjected to electrochemical corrosion, washing with distilled water, and drying. According to the pretreatment method for the titanium anode base material, the oxide skin on the surface is treated through the electrochemical corrosion technology, the operation safety risk is low, the stability of the titanium anode plate material is good, the electrolyte can be repeatedly used, and the treatment cost is low.

Description

technical field [0001] The invention relates to the technical field of titanium anode plate production, in particular to a pretreatment method for a titanium anode substrate. Background technique [0002] At present, the surface treatment process of titanium anode is sandblasting and roughening on the surface of the material, followed by annealing and leveling, and then oxalic acid pickling to remove the oxide scale. The process has the following problems: [0003] (1) The oxalic acid concentration of the oxalic acid pickling process is 8%, the working temperature is 90-100°C, and the pickling time is 2-3h. Due to the boiling state during the treatment process, a large amount of acid mist overflows, corrodes the axial environment, and the working environment is poor; [0004] (2) Oxalic acid is disposable and cannot be reused; [0005] (3) After surface treatment, an oxide layer is formed on the surface of the titanium material, and oxalic acid is used for pickling, which...

AI Technical Summary

Problems solved by technology

Due to the boiling state during the processing, a large amount of acid mist overflows, corroding the shaft environment, and the working environment is poor;

[0004] (2) Oxalic acid is disposable and cannot be reused;

[0005] (3) After the surface treatment, an oxide layer is formed on the surface of the titanium material. It is pickled with oxalic acid, and it is difficult to react with titanium oxide at 90-100°C; while oxalic acid will penetrate the oxide layer and react with titanium. The reaction is slow, but when the temperature reaches above 50°C, the dissolution rate of titanium is accelerated, and Ti is oxidized to Ti 3+ , H + It is reduced to hydrogen, and its chemical reaction formula is: Ti+C 2 h 2 0 4 =Ti(C 2 o 4 ) 2 +H 2 , the rate of oxalic acid corrosion of titanium is uncontrollable, and the corrosion amount of titanium material is relatively large, which will cause defects in titanium material and affect the quality of titanium anode;

[0006] (4) Before pickling treatment, the substrate must be roughened by sandblasting, which is too expensive