Erosion-corrosion Morphology of Cr13 Stainless Steel Induced by Jet Flow of Hydrochloric Acid Solution

doi:10.11902/1005.4537.2014.003

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (5): 439-444 DOI: 10.11902/1005.4537.2014.003

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Erosion-corrosion Morphology of Cr13 Stainless Steel Induced by Jet Flow of Hydrochloric Acid Solution

CHENG Congqian¹, CAO Tieshan¹, WANG Dongying², YAO Jingwen², WANG Jian¹, GUAN Meng², ZHAO Jie¹(

)

1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China
2. Nuclear Division, Shenyang Blower Works Group Co. Ltd, Shenyang 110001, China

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Abstract

Erosion-corrosion morphology of Cr13 stainless steel induced by jet flow of hydrochloric acid solution was characterized by means of SEM. Round-shaped pits was observed on the surface site corresponding to the center of impingement area of the jet flow. Around the center area, there exist radial patterns of comet-like grooves. The density of pits and grooves increases with increasing corrosion time. SEM micrographs reveal that the comet-like grooves composed of a pit as its head and a swallow-like groove as its tail, of which the head is initiated on the inclusion MnS particles; however, the tail is mainly laid on site of the martensite, while no obvious corrosion occurs on the δ-Ferrite zone of the steel.

Key words: stainless steel impingement corrosion morphology pit inclusion

ZTFLH:	TG172
	TG174
	TB304

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Cite this article:

CHENG Congqian, CAO Tieshan, WANG Dongying, YAO Jingwen, WANG Jian, GUAN Meng, ZHAO Jie. Erosion-corrosion Morphology of Cr13 Stainless Steel Induced by Jet Flow of Hydrochloric Acid Solution. Journal of Chinese Society for Corrosion and protection, 2014, 34(5): 439-444.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.003 OR https://www.jcscp.org/EN/Y2014/V34/I5/439

Fig.1 Schematic of experimental loop for corrosion test under flow jet impingement

Table 1 Microhardness at different microstructure zone of Cr13 stainless steel (loading force: 10 N)

Fig.2 Metallographic microstructure and indentation of Cr13 stainless steel

Fig.3 Macrographs of Cr13 stainless steel after impingement corrosion for 60 min: (a) sample surface, (b) region A in Fig.3a, (c) region B in Fig.3a

Fig.4 Typical morphology of black comet tail

Fig.5 Density of black point and comet tailat different regions on surface of Cr13 stainless steel after corrosion for different time

Fig.6 SEM micrograph of comet stripes at region B of Fig.3a

Fig.7 EDS element mapping of pit for Cr13 stainless steel after 15 min impingement corrosion: (a) morphology, (b) S, (c) Mn, (d) Al, (e) O

Fig.8 EDS element mapping at head of comet stripe for Cr13 stainless steel after 180 min impingement corrosion: (a) morphology, (b) S, (c) Mn, (d) Al, (e) O

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