钛焊管长时耐腐蚀性研究

李海明; 胡星光; 李军兆; 刘文正; 杨维军

doi:10.7513/j.issn.1004-7638.2023.04.013

钛焊管长时耐腐蚀性研究

doi: 10.7513/j.issn.1004-7638.2023.04.013

湖南湘投金天新材料有限公司, 湖南益阳 413000

基金项目: 湖南省科技创新计划项目(S2021GXKJCX0287, 2022RC1060, 2022GK4046)。

详细信息

作者简介:
李海明，1987年出生，湖南长沙人，工程师，通讯作者，主要从事钛焊管理化检测分析研究，E-mail：499481927@qq.com

中图分类号: TF823
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出版历程
- 收稿日期: 2023-03-22
- 刊出日期: 2023-08-30

Study on long time corrosion resistance of titanium welded tube

Hunan Xiangtou Goldsky New Materials Co., Ltd., Yiyang 413000, Hunan, China

摘要

摘要: 模拟不同工况条件，通过宏观尺寸检测、金相分析、力学性能测试等，研究钛焊管在自来水、质量分数为5%的氯化镁水溶液、海水、体积分数为10%的硫酸溶液中长时浸泡的耐腐蚀性能。结果表明，钛焊管在自来水、质量分数为5%的氯化镁水溶液、海水三种溶液中浸泡长达7年，几乎不出现腐蚀现象，腐蚀速率分别为0.333、0.466、0.466 μm/a，具备良好的耐腐蚀性能。钛焊管在体积分数为10%的硫酸溶液中长期浸泡，会出现腐蚀现象，壁厚减薄，减薄率为2%，腐蚀速率为1.398 μm/a，耐腐蚀性能较其他三种溶液下差。该研究对钛焊管在生活用水、制盐、海洋工程、海水淡化等环境的应用具有重要意义。
- 钛焊管 /
- 耐腐蚀性能 /
- 宏观尺寸 /
- 金相分析
Abstract: Simulating different operating conditions the corrosion resistance of titanium welded pipe in tap water, 5% magnesium chloride aqueous solution, seawater and 10% sulfuric acid solution soaked for a long time was studied through macro-size detection, metallographic analysis and mechanical properties test. The results show that there is almost no evident corrosion of titanium welded pipe after long-term immersion in tap water, 5% magnesium chloride aqueous solution and seawater. The corrosion rate is 0.333, 0.466 μm /year and 0.466 μm/year, respectively, representing a predominant corrosion resistance of titanium welded pipe. The titanium welded pipe can be corroded after a long-term immersion in 10% sulfuric acid solution. The wall of titanium welded pipe becomes thinned with a reduction rate of 2% . The corrosion rate is 1.398 μm/year, and the corrosion resistance is worse than the other three solutions. This research is of great significance to the application of titanium welded pipe in domestic water, salt making, ocean engineering and seawater desalination.
- titanium welded tube /
- corrosion resistance /
- macroscopic dimension /
- metallographic analysis

HTML全文

图 1 钛焊管宏观及焊缝横截面形貌

Figure 1. Macro and weld cross-sectional morphology of titanium welded tube

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图 2 钛焊管焊缝金相组织

Figure 2. Metallographic pictures of titanium welded tube weld

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图 3 钛焊管力学性能测试

Figure 3. Mechanical property test pictures of titanium welded tube

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图 4 经长时腐蚀后钛焊管表面状态

Figure 4. Surface state of titanium welded tube after long time corrosion

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图 5 经长时间腐蚀后钛焊管纵截面尺寸(a)～(d)和母材金相组织(e)～(h)

Figure 5. Dimension of longitudinal section (a)～(d) and metallographic structure (e)～(h) of base metal of titanium welded tube after long time corrosion

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图 6 钛焊管在自来水和硫酸介质下焊缝及熔合线金相组织

Figure 6. Metallographic structure of weld and fusion line of titanium welded tube in tap water and sulfuric acid

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表 1 钛焊管成分和性能

Table 1. Composition and properties of titanium welded tube

w/%							抗拉强度/MPa	屈服强度/MPa	延伸率/%
Fe	C	O	N	H	Ti	其他总和	抗拉强度/MPa	屈服强度/MPa	延伸率/%
0.045	0.02	0.08	0.003	0.0005	余量	＜0.4	454	342	39.2

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表 2 试验所用腐蚀介质

Table 2. Corrosion medium used in the experiment

试剂	级别	生产厂家	管材编号	模拟场景
自来水			1、2	生活用水
硫酸	AR	株洲市星空化玻有限责任公司	3、4	化工行业
氯化镁	AR	天津市风船化学试剂科技有限公司	5、6	制盐
海水		三亚地区	7、8	海洋工程、海水淡化

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表 3 钛焊管力学性能测试结果

Table 3. Mechanical properties results of titanium welded tube

R_m/ MPa	R_p0.2/ MPa	A₅₀/ %	反向展平	压扁	扩口	硬度( HV1 )
R_m/ MPa	R_p0.2/ MPa	A₅₀/ %	反向展平	压扁	扩口	焊缝	基材	热影响区
350	295	23	OK	OK	OK	175	152	155

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表 4 长时浸泡腐蚀前后钛焊管截面厚度和腐蚀速率

Table 4. Section thickness and corrosion rate of titanium welded tube before and after long time immersion corrosion

试样编号	母材质量/mm		减薄率/%	腐蚀速率/(μm·a⁻¹)
试样编号	浸泡前	浸泡后	减薄率/%	腐蚀速率/(μm·a⁻¹)
1	0.494	0.490	0.81	0.533
2	0.494	0.493	0.20	0.133
3	0.494	0.484	2.02	1.332
4	0.494	0.483	2.23	1.465
5	0.494	0.492	0.40	0.266
6	0.493	0.488	1.01	0.666
7	0.494	0.489	1.01	0.666
8	0.493	0.491	0.41	0.266

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