Effect of Intermetallic Compounds on Pitting Corrosion of Spark Plasma Sintered AA2024

Yanbing Meng; Songmei Li; Jianhua Liu; Mei Yu; Wen Ming Tian

doi:10.5006/3918

Effect of Intermetallic Compounds on Pitting Corrosion of Spark Plasma Sintered AA2024

Yanbing Meng
, Songmei Li^*
, Jianhua Liu
, Mei Yu
, Wen Ming Tian

^*Corresponding author for this work

School of Materials Science and Engineering

Beihang University
North China Institute of Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

The microstructures and electrochemical pitting behaviors of AA2024 in successive spark plasma sintering, solid solution treatment (SST), and aging treatment (AT) states were investigated. The effect of intermetallic compounds (IMCs) on corrosion behaviors of AA2024 was analyzed. It was observed that the number and size of IMCs decreased after SST, and increased again after subsequent AT. The as-SST sample showed the best pitting resistance. Corrosion morphologies analysis indicated that pits initiated at the periphery of IMCs, both the big and small particles might be the nucleation sites of pits. For the sintered AA2024, after immersion in 3.5 wt% NaCl solution for 30 min, the critical size for IMCs causing pits is 0.107 μm². For the IMCs bigger than this size, whether pits initiate around them during immersion depended on the potential difference of these particles with the matrix.

Original language	English
Pages (from-to)	572-583
Number of pages	12
Journal	Corrosion
Volume	78
Issue number	7
DOIs	https://doi.org/10.5006/3918
State	Published - Jul 2022

Keywords

AA2024
heat treatment
microstructure
pitting corrosion
potential difference

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10.5006/3918

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@article{99dce17c12b8455abf01e578d296b777,

title = "Effect of Intermetallic Compounds on Pitting Corrosion of Spark Plasma Sintered AA2024",

abstract = "The microstructures and electrochemical pitting behaviors of AA2024 in successive spark plasma sintering, solid solution treatment (SST), and aging treatment (AT) states were investigated. The effect of intermetallic compounds (IMCs) on corrosion behaviors of AA2024 was analyzed. It was observed that the number and size of IMCs decreased after SST, and increased again after subsequent AT. The as-SST sample showed the best pitting resistance. Corrosion morphologies analysis indicated that pits initiated at the periphery of IMCs, both the big and small particles might be the nucleation sites of pits. For the sintered AA2024, after immersion in 3.5 wt\% NaCl solution for 30 min, the critical size for IMCs causing pits is 0.107 μm2. For the IMCs bigger than this size, whether pits initiate around them during immersion depended on the potential difference of these particles with the matrix.",

keywords = "AA2024, heat treatment, microstructure, pitting corrosion, potential difference",

author = "Yanbing Meng and Songmei Li and Jianhua Liu and Mei Yu and Tian, \{Wen Ming\}",

note = "Publisher Copyright: {\textcopyright} 2022 AMPP.",

year = "2022",

month = jul,

doi = "10.5006/3918",

language = "英语",

volume = "78",

pages = "572--583",

journal = "Corrosion",

issn = "0010-9312",

publisher = "Association for Materials Protection and Performance",

number = "7",

}

TY - JOUR

T1 - Effect of Intermetallic Compounds on Pitting Corrosion of Spark Plasma Sintered AA2024

AU - Meng, Yanbing

AU - Li, Songmei

AU - Liu, Jianhua

AU - Yu, Mei

AU - Tian, Wen Ming

PY - 2022/7

Y1 - 2022/7

N2 - The microstructures and electrochemical pitting behaviors of AA2024 in successive spark plasma sintering, solid solution treatment (SST), and aging treatment (AT) states were investigated. The effect of intermetallic compounds (IMCs) on corrosion behaviors of AA2024 was analyzed. It was observed that the number and size of IMCs decreased after SST, and increased again after subsequent AT. The as-SST sample showed the best pitting resistance. Corrosion morphologies analysis indicated that pits initiated at the periphery of IMCs, both the big and small particles might be the nucleation sites of pits. For the sintered AA2024, after immersion in 3.5 wt% NaCl solution for 30 min, the critical size for IMCs causing pits is 0.107 μm2. For the IMCs bigger than this size, whether pits initiate around them during immersion depended on the potential difference of these particles with the matrix.

AB - The microstructures and electrochemical pitting behaviors of AA2024 in successive spark plasma sintering, solid solution treatment (SST), and aging treatment (AT) states were investigated. The effect of intermetallic compounds (IMCs) on corrosion behaviors of AA2024 was analyzed. It was observed that the number and size of IMCs decreased after SST, and increased again after subsequent AT. The as-SST sample showed the best pitting resistance. Corrosion morphologies analysis indicated that pits initiated at the periphery of IMCs, both the big and small particles might be the nucleation sites of pits. For the sintered AA2024, after immersion in 3.5 wt% NaCl solution for 30 min, the critical size for IMCs causing pits is 0.107 μm2. For the IMCs bigger than this size, whether pits initiate around them during immersion depended on the potential difference of these particles with the matrix.

KW - AA2024

KW - heat treatment

KW - microstructure

KW - pitting corrosion

KW - potential difference

UR - https://www.scopus.com/pages/publications/85139037435

U2 - 10.5006/3918

DO - 10.5006/3918

M3 - 文章

AN - SCOPUS:85139037435

SN - 0010-9312

VL - 78

SP - 572

EP - 583

JO - Corrosion

JF - Corrosion

IS - 7

ER -

Effect of Intermetallic Compounds on Pitting Corrosion of Spark Plasma Sintered AA2024

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