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Acid pickling process for TC4 titanium alloy sheet strip

A titanium alloy plate, 1.TC4 technology, applied in the field of metal surface treatment technology, can solve problems such as low efficiency and uneven reaction, and achieve the effect of improving reaction efficiency and improving surface finish

Inactive Publication Date: 2019-11-26
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome defects such as low efficiency and uneven reaction in the existing TC4 titanium alloy strip pickling method, the technical problem to be solved by the present invention is to provide a kind of acid pickling method that can shorten the pickling time and improve production efficiency and product quality. washing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] ① First, the TC4 titanium alloy plate is annealed at 600 ° C, and the annealing time is 120 min. Shot blasting is carried out before pickling, and the current of the blasting head of the shot blasting machine is 40A to ensure that the surface oxide skin is thrown clean.

[0030] ② After shot blasting, pre-clean the strip with 65°C water. After entering the acid tank for pickling, the acid tank pickling is HNO 3 Mixed acid with HF, HNO 3 The concentration is 100g / l, the HF concentration is 8g / l, and the pickling time is 10min.

[0031] ③Clean the titanium belt after pickling with 50°C water, rinse it with water at the same time, and then dry it with a dryer.

Embodiment 2

[0033] ① First, the TC4 titanium alloy plate is annealed at 650 ° C, and the annealing time is 100 min. Shot blasting is carried out before pickling, and the current of the blasting head of the shot blasting machine is 50A to ensure that the oxide skin on the surface is thrown clean.

[0034] ② After shot blasting, pre-clean the strip with 70°C water. After entering the acid tank for pickling, the acid tank pickling is HNO 3 Mixed acid with HF, HNO 3 The concentration is 150g / l, the HF concentration is 12g / l, and the pickling time is 8min.

[0035] ③Clean the titanium strip with 60°C water after pickling, rinse it with water at the same time, and then dry it with a dryer.

Embodiment 3

[0037] ① First, the TC4 titanium alloy plate is annealed at 700 ° C, and the annealing time is 50 minutes. Shot blasting is carried out before pickling, and the current of the blasting head of the shot blasting machine is 60A to ensure that the oxide skin on the surface is thrown clean.

[0038] ② After shot blasting, pre-clean the strip with 75°C water. Then enter the acid tank for pickling. Acid tank pickling for HNO 3 Mixed acid with HF, HNO 3 The concentration is 200g / l, the HF concentration is 16g / l, and the pickling time is 5min.

[0039] ③Clean the titanium strip with 65°C water after pickling, rinse it with water at the same time, and then dry it with a dryer.

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Abstract

The invention discloses an acid pickling process for a TC4 titanium alloy sheet strip and belongs to the field of a surface treatment process of metals. The acid pickling process comprises the following steps of: firstly, annealing the TC4 titanium alloy sheet strip; subsequently implementing shot blasting treatment on the plate strip, afterwards washing the shot-blasted plate strip and then implementing acid pickling on the plate strip in an acid tank, wherein the acid in the acid tank is mixed acid of HNO3 and HF; and finally washing the acid-pickled plate strip by using clean water and drying the plate strip by using a drier. According to the acid pickling process disclosed by the invention, by implementing annealing and shot blasting treatment on the TC4 titanium alloy plate strip, theoxide skin on the surface of the TC4 titanium alloy plate strip is crushed to form a rough surface; in a subsequent acid pickling process, the incompact oxide skin can have full contact reaction withacid pickling liquid, thus the reaction efficiency is improved, and whether the reaction is ended or not can be judged quite simply, so excessive acid pickling is prevented, the surface quality of the plate strip is not affected, and finally the surface smoothness of the plate strip is improved.

Description

technical field [0001] The invention relates to the field of metal surface treatment technology, in particular to a pickling process for TC4 titanium alloy plates. Background technique [0002] After hot rolling, the surface of TC4 titanium alloy strip tends to produce a layer of dense oxide layer, which is dark brown, hard and brittle. Before the TC4 titanium alloy plate is used, it needs to be surface treated to remove its surface oxide skin and prepare for the subsequent deep processing. The oxide layer of TC4 titanium alloy plate is mainly TiO 2 , followed by low-valent titanium oxides Ti0, Ti 2 0 3 and high-valent oxide TiO 3 Wait. At present, the removal of oxide layer mainly adopts pickling process, using HNO 3 Cleaning with mixed acid of HF, in which HF mainly reacts with the oxide layer, HNO 3 The main function of titanium is to play a catalytic role. The main reaction formula of titanium and hydrofluoric acid is: 2Ti+6HF=2TiF 3 +3H 2 ↑. [0003] According...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/10C22F1/18
CPCC22F1/183C23G1/106
Inventor 林崇智王莹杨柳
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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