纯Ni母材及焊缝在熔融Na2SO4-K2SO4中热腐蚀研究

doi:10.11902/1005.4537.2017.133

中国腐蚀与防护学报

2018, Vol. 38

Issue (5): 495-501 DOI: 10.11902/1005.4537.2017.133

研究报告

本期目录 | 过刊浏览

纯Ni母材及焊缝在熔融Na₂SO₄-K₂SO₄中热腐蚀研究

王希靖¹(

), 王博士¹, 杨超¹, 杨艳², 沈斌³

1 兰州理工大学有色金属先进加工与再利用省部共建国家重点试验室兰州 730050
2 金川集团股份有限公司镍钴资源综合利用国家重点实验室金昌 737104
3 金川镍都实业有限公司金昌 737104

Hot Corrosion of Pure Nickel and Its Weld Joints in Molten Na₂SO₄-K₂SO₄ Salts

Xijing WANG¹(

), Boshi WANG¹, Chao YANG¹, Yan YANG², Bin SHEN³

1 State Key Laboratory of Gansu Advanced Nonferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China
2 State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchuan Group Cooperation Ltd., Jinchang 737104, China
3 Jinchuan Nickel Industrial Cooperation Ltd., Jinchang 737104, China

全文: PDF(6429 KB) HTML

摘要:

通过对纯Ni在PAW和PAW+TIG两种不同焊接工艺下得到的焊缝及母材进行恒温的熔融硫酸盐热腐蚀实验,对腐蚀产物横断面进行形貌观察及微区成分分析,研究不同焊缝工艺下得到的焊缝组织和母材在恒温热腐蚀期间的腐蚀产物分布特征、腐蚀行为和腐蚀机理。结果表明,采用PAW和PAW+TIG两种焊接工艺方法所得焊缝的晶粒尺寸相差不大,在熔融Na₂SO₄-K₂SO₄中焊缝的抗热腐蚀性能相近,但明显低于母材的抗热腐蚀性能。在热腐蚀期间,热腐蚀形态往往包括一个位于表面氧化膜内侧、向基体内部延伸的内氧化物与内硫化物分布区的硫化-氧化循环过程,S在热腐蚀过程中起着重要的作用。针对纯Ni的PAW+TIG焊接方法比较符合工业实际生产及应用要求。

关键词 ：纯Ni, PAW+TIG焊接, 熔盐, 热腐蚀机理, 硫化-氧化循环

Abstract：

Hot corrosion behavior of pure nickel and its joints, which were prepared by plasma arc welding (PAW) and plasma arc welding+tungsten inert gas (PAW+TIG) respectively, in molten Na₂SO₄-K₂SO₄ salts at 900 ℃ are investigated by means of weight loss measurements, X-ray diffractometer (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). Experimental results show that the grain size and hot corrosion resistance of the welds obtained by the two welding methods have little difference, while the corrosion resistance of the joints is inferior to that of the base metal. The hot corrosion kinetics of the specimens follow linear power laws, and the corrosion products on the base metal and joints are mainly composed of NiO and Ni₃S₂. Cross-sectional morphologies and corresponding elemental maps indicate that corrosion product composed of an outer dense scale, beneath which there existed an internal zone of oxides and sulfides. According to these results, a mechanism of synergistic oxidation and sulfidation for hot corrosion of pure nickel is confirmed. That is, the distribution of internal oxides and sulfides, located beneath the outer oxide scale , extends to the substrate. In other words, the sulfidation-oxidation cycle process and sulfur play an important role in the process of hot corrosion. So,for pure nickel welding, PAW+TIG welding method meets the requirements of the actual industrial production and application.

Key words： pure nickel PAW+TIG welding molten sulfate hot corrosion mechanism sulfidation-oxidation cycle

收稿日期: 2017-08-07

ZTFLH:

TG174.4

基金资助:镍钴资源综合利用国家重点实验室项目 (301170501)

作者简介:

作者简介王希靖,男,1956年生,教授

	服务

	把本文推荐给朋友
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	王希靖
	王博士
	杨超
	杨艳
	沈斌
44.8K

引用本文:

王希靖, 王博士, 杨超, 杨艳, 沈斌. 纯Ni母材及焊缝在熔融Na₂SO₄-K₂SO₄中热腐蚀研究[J]. 中国腐蚀与防护学报, 2018, 38(5): 495-501.
Xijing WANG, Boshi WANG, Chao YANG, Yan YANG, Bin SHEN. Hot Corrosion of Pure Nickel and Its Weld Joints in Molten Na₂SO₄-K₂SO₄ Salts. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 495-501.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.133 或 https://www.jcscp.org/CN/Y2018/V38/I5/495

图1 双枪布置示意图

表1 实验中两种焊接方法的具体工艺参数

图2 母材及两种焊接接头的显微组织

图4 Ni母材及两种焊缝在900 ℃下75%Na2SO4-25%K2SO4混合盐中腐蚀72 h后表面的腐蚀产物形貌和腐蚀产物组成

图5 母材及两种焊缝试样在900 ℃下75%Na2SO4-25%K2SO4混合盐中腐蚀72 h后的截面形貌

图6 母材及两种焊缝试样在900 ℃下75%Na2SO4-25%K2SO4混合盐中腐蚀72 h后的截面形貌及成分分布

图7 试样在900 ℃下75%Na2SO4-25%K2SO4混合盐中腐蚀72 h期间的腐蚀过程示意图

[1]	Komath M.Hot corrosion of nickel in anhydrous sodium hydroxide[J]. Mater. Chem. Phys., 1996, 45: 171
[2]	Abd El-Haleem S M, Abd El-Wanees S. Chloride induced pitting corrosion of nickel in alkaline solutions and its inhibition by organic amines[J]. Mater. Chem. Phys., 2011, 128: 418
[3]	Lv J L, Liang T X, Wang C.Effect of electrodeposition temperature on grain orientation and corrosion resistance of nanocrystalline pure nickel[J]. J. Solid State Chem., 2016, 240: 109
[4]	Sequeira C A C, Cardoso D S P, Amaral L, et al. On the performance of commercially available corrosion-resistant nickel alloys: A review[J]. Corros. Rev., 2016, 34: 187
[5]	Ramkumar K D, Abraham W S, Viyash V, et al.Investigations on the microstructure, tensile strength and high temperature corrosion behaviour of Inconel 625 and Inconel 718 dissimilar joints[J]. J. Manuf. Process., 2017, 25: 306
[6]	Mortezaie A, Shamanian M.An assessment of microstructure, mechanical properties and corrosion resistance of dissimilar welds between Inconel 718 and 310S austenitic stainless steel[J]. Int. J. Pres. Ves. Pip., 2014, 116: 37
[7]	Zhang J W, Wang W X, Huang Y P, et al.Electrochemical corrosion properties for weld metal of austenitic stainless steel[J]. Trans. China Weld. Inst., 2007, 28(2): 103(张俊旺, 王文先, 黄延平等. 奥氏体不锈钢焊缝金属的电化学腐蚀性能[J]. 焊接学报, 2007, 28(2): 103)
[8]	Li Y S, Wang F G, Zhu Y, et al.Corrosion of pure Ni and two Ni-based alloys in presence of ZnCl2-KCl salt deposit[J]. Rare Met.Mater. Eng., 2001, 30: 376(李远士, 王富岗, 朱焱等. 纯Ni和Ni基合金在ZnCl2-KCl盐膜下的腐蚀[J]. 稀有金属材料与工程, 2001, 30: 376)
[9]	Ma H T.High temperature corrosion of metallic materials induced by chloride salts [D]. Dalian: Dalian University of Technology, 2003(马海涛. 高温氯盐环境中金属材料的腐蚀 [D]. 大连: 大连理工大学, 2003)
[10]	Wang X J, Wang B S, Zhang D.Hot corrosion behavior of pure nickel in 900 ℃ molten salt[J]. J. Lanzhou Univ. Technol., 2018, 44(2): 12(王希靖, 王博士, 张东. 纯镍在900 ℃熔盐中的热腐蚀行为[J]. 兰州理工大学学报, 2018, 44(2): 12)
[11]	Zhu R Z, Zheng X G.A study of accelrated corrosion of nickel in molten salts at 705 ℃[J]. J. Chin. Soc. Corros. Prot., 1987, 7: 207(朱日彰, 郑晓光. 镍在705 ℃熔盐中加速腐蚀的研究[J]. 中国腐蚀与防护学报, 1987, 7: 207)
[12]	Ning L K.Investigation on the hot corrosion resistance of four Ni-based superalloys [D]. Dalian: Dalian University of Technology, 2008(宁礼奎. 四种镍基高温合金的抗热腐蚀性能研究 [D]. 大连: 大连理工大学, 2008)
[13]	Lei Z, Zhang M C, Dong J X.Hot corrosion behavior of powder metallurgy Rene95 nickel-based superalloy in molten NaCl-Na2SO4 salts[J]. Mater. Des., 2011, 32: 1981
[14]	Li W J, Liu Y, Wang Y, et al.Hot corrosion behavior of Ni-16Cr-xAl based alloys in mixture of Na2SO4-NaCl at 600 ℃[J]. Trans. Nonferrous Met. Soc. China, 2011, 21: 2617
[15]	Li T F.Alloy High Temperature Oxidation and Hot Corrosion [M]. Beijing: Chemical Industry Press, 2003: 17(李铁藩. 金属高温氧化和热腐蚀 [M]. 北京: 化学工业出版社, 2003, 17)
[16]	Zhang Y S, Shi S T.An electrochemical model proposed for hot corrosion mechanisms[J]. Corros. Sci. Prot. Technol., 1993, 5(1): 23(张允书, 石声泰. 热腐蚀的电化学机理初探[J]. 腐蚀科学与防护技术, 1993, 5(1): 23)
[17]	Lu X D, Tian S G, Chen T, et al.Internal oxidation and internal sulfuration of Ni-base alloy with high Cr content during hot corrosion in molten sulfate[J]. Rare Met. Mater. Eng., 2014, 43(1): 79(卢旭东, 田素贵, 陈涛等. 高铬镍基合金熔融硫酸盐热腐蚀过程中内氧化和内硫化行为的研究[J]. 稀有金属材料与工程, 2014, 43(1): 79)

[1]	左勇, 曹明鹏, 申淼, 杨新梅. MgCl₂-NaCl-KCl熔盐体系中金属Mg对316H不锈钢的缓蚀性能研究[J]. 中国腐蚀与防护学报, 2021, 41(1): 80-86.
[2]	秦越强, 左勇, 申淼. FLiNaK-CrF₃/CrF₂氧化还原缓冲熔盐体系对316L不锈钢耐蚀性能的影响[J]. 中国腐蚀与防护学报, 2020, 40(2): 182-190.
[3]	陈超,梁艳芬,梁天权,满泉言,罗毅东,张修海,曾建民. 稀土复合掺杂ZrO₂陶瓷涂层抗Na₂SO₄+NaVO₃热腐蚀性能的研究进展[J]. 中国腐蚀与防护学报, 2019, 39(4): 291-298.
[4]	刘辉,邱玮,冷滨,俞国军. 304和316H不锈钢在LiF-NaF-KF熔盐中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2019, 39(1): 51-58.
[5]	刘光明,刘康生,毛晓飞,万中平,黄健航,于明明,汪元奎. T91钢在KCl+Na₂SO₄+K₂SO₄熔融盐中的热腐蚀行为研究[J]. 中国腐蚀与防护学报, 2017, 37(1): 23-28.
[6]	丁祥彬,孙华,俞国军,周兴泰. Hastelloy N合金和316L不锈钢在LiF-NaF-KF熔盐中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2015, 35(6): 543-548.
[7]	徐雅欣, 曾潮流. 熔盐电堆的材料腐蚀[J]. 中国腐蚀与防护学报, 2014, 34(3): 211-217.
[8]	耿树江; 朱圣龙; 王福会 . 纯Ni及其溅射纳米晶的高温氧化行为[J]. 中国腐蚀与防护学报, 2003, 23(6): 335-339 .
[9]	耿树江; 朱圣龙; 王福会 . 纯Ni在600℃～700℃固态NaCl和水蒸气综合作用下的腐蚀行为[J]. 中国腐蚀与防护学报, 2003, 23(5): 262-265 .
[10]	白宝云; 罗兴宏; 范存淦 . 奥氏体不锈钢在熔融碳酸盐中的腐蚀[J]. 中国腐蚀与防护学报, 2002, 22(5): 278-281 .
[11]	徐颂波;陈俊明. Ni_3Al(B)系金属间化合物在Li_2CO_3-K_2CO_3熔盐中的腐蚀电化学行为[J]. 中国腐蚀与防护学报, 1995, 15(3): 161-166.
[12]	陈俊明;徐颂波. Ni_3Al(B)系金属间化合物在LiCl-KCl熔盐中的腐蚀电化学行为[J]. 中国腐蚀与防护学报, 1995, 15(3): 167-172.

Viewed

Full text

Abstract

Cited

Shared

Discussed