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Title:
TITANIUM TUBE FOR TUBULAR HEAT EXCHANGER
Document Type and Number:
WIPO Patent Application WO/2019/084987
Kind Code:
A1
Abstract:
The present invention discloses a titanium tube for a tubular heat exchanger, a titanium tube body thereof having undergone a passivation treatment. The passivation treatment comprises the following steps: 1) adding 1-2 parts by weight of orthophosphoric acid, 1.1 parts by weight of ethanolamine, 0.8 parts by weight of thiourea, 2.2 parts by weight of butyl acetate, and 4.6 parts by weight of nonylphenol ethoxylate carboxylate sequentially into 25 parts by weight of deionized water and stirring well; 2) further, sequentially adding 0.4 parts by weight of potassium dihydrogen phosphate, 1.5 parts by weight of sodium tripolyphosphate, 1.4 parts by weight of sodium alkyl sulfate, 1.7 parts by weight of 1-hydroxybenzotriazole, and 2.2 parts by weight of inositol hexaphosphate, and stirring continuously until thoroughly mixed to obtain a passivation treatment solution; 3) adding a titanium tube body into the passivation treatment solution for passivation treatment, wherein the treatment temperature is 50°C and the treatment time is 30 seconds, washing the titanium tube body with pure water upon removal and then drying the same.

Inventors:
WANG, Yufeng (No. 8, Xin Feng Cun Meili Town, Changsh, Suzhou Jiangsu 0, 215500, CN)
Application Number:
CN2017/109881
Publication Date:
May 09, 2019
Filing Date:
November 08, 2017
Export Citation:
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Assignee:
CHANGSHU OUDI PIPE INDUSTRY CO.,LTD (No. 8, Xin Feng Cun Meili Town, Changsh, Suzhou Jiangsu 0, 215500, CN)
International Classes:
C23C22/08; F28F19/02; F28F21/08
Foreign References:
CN105397430A2016-03-16
CN104694915A2015-06-10
CN105951082A2016-09-21
CN106148935A2016-11-23
CN102168265A2011-08-31
CN105349979A2016-02-24
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