EFFECTS OF TEMPER ON EXFOLIATION CORROSION OF 7150 ALLOY

J Chin Soc Corr Pro

2010, Vol. 30

Issue (6): 487-490 DOI:

Research Articles

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EFFECTS OF TEMPER ON EXFOLIATION CORROSION OF 7150 ALLOY

HUANG Changlong^1,2, XU Hairong²

1. School of Aeronautics, Northwestern Polytechnic University, Xi'an 710072
2. Guangzhou Civil Aviation College, Guangzhou 510403

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Abstract The effects of temper on EFC of 7150 alloy, which is prevalent on aging airplane structure, had been investigated by means of corrosion test on T6, T73 and T77 temper in oceanic environment and transmission electron microcopy (TEM). The test results shown that T77 temper was the best for EFC resistance, T73 temper was the next and T6 temper was the worst. The test results also shown that the wedging stress produced by the corrosion product at the grain boundary of 7150-T77 alloy can not sustain the EFC development. TEM observation shown that continuous η phase existed at the grain boundary of T6 temper. The grain boundary of T73 and T77 temper had PFZ zone and dispersed η phase. The PFZ of T77 temper was thicker than T73 temper. The particles of η phase at the grain boundary of T77 temper were coarser than T73 temper. We can draw a conclusion that the microstructure in grain boundary zone of 7150 alloy is the key factor to the EFC resistance.

Key words: 7150 alloy exfoliation corrosion temper grain boundary precipitates PFZ matrix

Received: 04 May 2010

ZTFLH:

TG146.1

Corresponding Authors: HUANG Changlong E-mail: richardhcl@vip.sina.com

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Cite this article:

HUANG Changlong, XU Hairong. EFFECTS OF TEMPER ON EXFOLIATION CORROSION OF 7150 ALLOY. J Chin Soc Corr Pro, 2010, 30(6): 487-490.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2010/V30/I6/487

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