INFLUENCE OF THERMAL-RATE TREATMENT ON THE CORROSION RESISTANCE OF Mg-7Al-0.4Zn-0.2Mn ALLOY

J Chin Soc Corr Pro

2006, Vol. 26

Issue (3): 141-145 DOI:

Research Report

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INFLUENCE OF THERMAL-RATE TREATMENT ON THE CORROSION RESISTANCE OF Mg-7Al-0.4Zn-0.2Mn ALLOY

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郑州大学材料科学与工程学院

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Abstract The influence of thermal-rate treatment on the corrosion resistance of Mg-7Al-0.4Zn-0.2Mn(AZ70)alloy was studied by observing corrosion morphology,measuring corrosion potential and salt-spray corrosion rate.The results show that the corrosion behavior of AZ70 alloy depends on both its microstructure and iron content.When Ts is 850 ℃,grains are fined and the size of βphase and the distance betweenβphase pasticles are small.The corrosion barrier effect ofβ phase onαphase is enhanced and the iron content does not increase much at this temperature.So the corrosion resistance is improved.The corrosion resistance of AZ70 alloy falls off when Ts is 890 ℃,which attributes to the presence of microporosity,hot cracking and increase of iron content.At the same superheat-temperature,the corrosion resistance is improved with the increase of chilling rate.In comprehensive consideration of microstructure and corrosion resistance of AZ70 alloy,the optimal TRT process is that Ts=850 ℃ and Vc=2.0 ℃/s.In that case,the corrosion potential is 15 mV higher and the salt-spray corrosion rate is 21.9% lower than that of un-TRT treated alloy.

Key words: Mg-7Al-0.4Zn-0.2Mn(AZ70) alloy Thermal-rate treatment(TRT) Microstructure Grain refinement Corrosion

Received: 15 November 2005

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. INFLUENCE OF THERMAL-RATE TREATMENT ON THE CORROSION RESISTANCE OF Mg-7Al-0.4Zn-0.2Mn ALLOY. J Chin Soc Corr Pro, 2006, 26(3): 141-145 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2006/V26/I3/141

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