Acta Metall Sin  1997, Vol. 33 Issue (10): 1040-1046    DOI:

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IN SITU INVESTIGATION OF PITTING INITIATION AND PROPAGATION IN SiC_p /2024 Al METAL MATRIX C0MPOSITES

FENG Zude; LIN Changjian;TAN Jianguang (State Key Laboratory for Physical Chemistry of the Solid Surface; Xiamen University; Xiamen 361005) LIN Junshan(Shanghai Jiaotong University; Shanghai 200030)

FENG Zude; LIN Changjian;TAN Jianguang (State Key Laboratory for Physical Chemistry of the Solid Surface; Xiamen University; Xiamen 361005) LIN Junshan(Shanghai Jiaotong University; Shanghai 200030). IN SITU INVESTIGATION OF PITTING INITIATION AND PROPAGATION IN SiC_p /2024 Al METAL MATRIX C0MPOSITES. Acta Metall Sin, 1997, 33(10): 1040-1046.

Abstract References Related Articles Recommended Metrics Download:  PDF(1206KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The corrosion characteristics of as-cast SiCp/ 2024 al composites in chloride (Cl-) media were investigated using scanning micro reference electrode technique,electrochemical analysis and scanning electron microscopy. The composites have less resistant to pit initiation than the corresponding aluminum alloy. The increase in volume fraction of SiCp reinforced phase resulted in a signiflcant decrease of pitting potential. In situ mapping of the active centers in composites revealed that local breakdown of passivity and micropitting corrosion could happen even at the open-circuit potentials, and the increase of volume fraction of SiC particles reinforced phase in the composites led t0 a significant increase of active centers on their surfaces. Pitting corrosion attack occured preferentially at the interfaces of SiC / al, and al2Cu or (Cu, Fe, Mn)al6 inclusions / al for the composites. Key words:  Al-based metal metrix composite      scanning micro reference electrode technique      pitting corrosion      initiation stage      Received:  18 October 1997      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1997/V33/I10/1040 1 Lucas K a, Clarke H. Corrosion of aluminum-based metal matrix composites. Somerset, England;Research Studies Press Ltd. 1993: 6 2 Sun H, Koo E Y, Wheat H G. Corrosion, 1991. 47; 741 3 Buarzaige M M, Thorpe S J. Corrosion, 1994; 50:176 4 Roper G M, attwood P a. J Maler Sci, 1995, 30:898 5 Nunes P C R, Ramanathan L V. Corrosion, 1995; 51:610 6 Coleman S L, Scott V D, McEnaney B. J Mater Sci, 1994, 29:2826 7 Trowsdale a J, Noble B, Harris S J, Gibbins I S R et al. 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