Corrosion Behavior of Ni-based Weld Metals with Different Mo Content in a Nitric Acid Aqueous Solution

doi:10.11901/1005.3093.2018.714

Chinese Journal of Materials Research

2019, Vol. 33

Issue (6): 401-408 DOI: 10.11901/1005.3093.2018.714

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Corrosion Behavior of Ni-based Weld Metals with Different Mo Content in a Nitric Acid Aqueous Solution

Xu ZHANG^1,^2,³,Shanping LU^1,²(

)

1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

Xu ZHANG,Shanping LU. Corrosion Behavior of Ni-based Weld Metals with Different Mo Content in a Nitric Acid Aqueous Solution. Chinese Journal of Materials Research, 2019, 33(6): 401-408.

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Abstract

Welding overlayers of three welding wires containing various concentrations of Mo have been fabricated as the experimental materials via multiple semiautomatic gas tungsten arc welding (GTAW) with cold-wire feed. Then post-weld heat treatment is carried out at 620℃ for 29 h to reduce the welding residual stress. The corrosion resistance of the as-weld and heat-treated Ni-based weld metals is assessed in 65% nitric acid aqueous solution at 117℃ for 48 h. The results show that weld metals were suffered from several types of localized corrosion in the test medium, such as intergranular corrosion (IGC), pitting corrosion and interdendritic corrosion (IDC). Mo can promote the precipitation of Laves phase in the interdendritic region. Due to the electrochemical difference between the Laves phases and the matrix, pitting susceptibility of the Ni-based weld metals increase with the increase of Mo content. Further, the IDC takes place in the heat-treated weld metals. The electrochemical difference between the dendrite and the interdendritic region is the key factor for IDC. Mo can influence the diffusion of Ni and Cr during the post heat treatment and decrease the depletion degree of Cr and Ni in the interdendritic zone, then the degree of IDC drops for the heat-treated weld metals with addition of Mo.

Key words: materials failure and protection corrosion resistance ASTM-262A Ni-based weld metals Mo

Received: 17 December 2018

ZTFLH:

TG422.3

Fund: Key Research Program of Chinese Academy of Sciences(No. ZDRW-CN-2017-1);Key Research & Development Program of Jiangsu Province(No. BE2018113);National Natural Science Foundation of China(No. 51474203)

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.714 OR https://www.cjmr.org/EN/Y2019/V33/I6/401

Fig.1 Schematic diagram of butt weldment and sampling location of corrosion test specimens (unit:mm)

Table 1 Chemical composition of the weld metals (mass fraction,%)

Fig.2 OM micrograph of the as-welded metals microstructure (a) 0Mo; (b) 2Mo; (c) 4Mo

Fig.3 Precipitation in the as-weld alloys (a1, a2) 0Mo, (b1, b2) 2Mo, (c1, c2) 4Mo

Fig.4 Microstructure of the heat treated weld metals (a) 0Mo, (b) 2Mo, (c) 4Mo

Fig.5 Mass loss rate of weld metals as a function of the content of Mo

Fig.6 Corrosion surface appearance of the as-weld alloys (a) 0Mo, (b) 2Mo, (c) 4Mo

Fig.7 Morphology of the cross section of the pits in 4Mo weld metal (a) and the EDS line scanning result (b)

Fig.8 Corrosion samples surfaces of the heat treated weld metals (a1, a2) 0Mo；(b1, b2) 2Mo；(c1, c2) 4Mo

Fig.9 Element distribution in the interdendritic region of the heat-treated weld metals (a) 0Mo, (b) 2Mo, (c) 4Mo

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