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Electrochemical corrosion behavior of acid treated strip cast AM50 and AZX310 magnesium alloys in 3.5 wt.% NaCl solution

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Journal of Magnesium and Alloys 2017年第3期5卷 277-285页

作者： Srinivasan Arthanari rajendran nallaiyan Shin Kwang Seon Magnesium Technology Innovation Center School of Materials Science and EngineeringSeoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea Department of Chemistry Anna UniversityChennai 600025TamilnaduIndia

The influence of acid treatments on the surface morphology and electrochemical corrosion behavior of strip-cast AM50 and AZX310 alloys have been studied in the present *** alloys were acid treated using H_(3)PO_(4)(AT-1),HF(AT-2)and HNO3(AT-3)for different treatment durations viz.,60,300 and 600 *** acid treatments produced a surface layer consisting of corresponding magnesium salts of the acids and were confirmed from the X-ray diffraction(XRD),scanning electron microscopy(SEM)and energy dispersive X-ray analysis(EDAX).AT-1 treatment produced cracked and network porous morphology for AM50 and AZX310 alloys respectively andAT-3 treatment exhibited dense creaked surface layer formation while AT-2 does not produce any significant change in the *** studies revealed that,the acid treatment significantly altered the corrosion process by altering anodic and cathodic reaction rates of AM50 and AZX310 *** HNO3(AT-3)treatment was effective compared to other treatments to control the corrosion rate in the studied treatment *** surface morphology and chemical composition of surface layer produced during the treatment was correlated to explain the corrosion results.

关键词： Magnesium Pretreatment Corrosion Acid treatment Polarization

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Monitoring of pH and Chloride Ion Within The Rust of Low Alloy Steels Under Atmospheric Corrosion Environment

Monitoring of pH and Chloride Ion Within The Rust of Low All...

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第二届先进钢铁结构材料国际会议

作者： nallaiyan rajendran Toshiyasu NISHIMURA Corrosion Resistant Design Group Steel Research Center National Institute for Materials Science (NIMS) Tsukuba 305-0047 Japan

The pH and chloride ion concentration within the rust of low alloy steels were monitored using tungsten/tungsten oxide microelectrode and silver/silver chloride microelectrode probes after wet/ dry corrosion testing using 0.5% mass sodium chloride solution. The pH value of the carbon steel within the rust is found to be declined to very low values with the number of cycles in the corrosion test, which indicated that Cl ions penetrates in to the inner rust. How ever, pH values monitored for the steel containing 0.8 mass % Al, 3.0 mass % Ni and 2.0 mass % Si showed only a marginal decrease in pH within the rust. Based on these results, the rust formed on the low alloy steels prevents the formation of acidity within the rust., which in turn, these alloys exhibits excellent corrosion resistance. Hence, the alloying elements namely Al, Ni and Si plays a vital role in the rust formation of low alloy steels, prevents the ingress of chloride ions which in turn decreases the pH within the rust.

关键词： pH Ag/AgCl Microelectrode Low Alloy Steels Atmospheric Corrosion

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