Effects of Ni and Co on the Corrosion Resistance of Al-Si-Cu-Zn-Fe Alloys in NaCl Solution
نویسندگان
چکیده
The corrosion behavior of Fe-containing directionally solidified (DS) and centrifugally cast (CC) Al-Si-Cu-Zn alloys with either Co or Ni additions has been investigated. Electrochemical immersion methods were used to investigate the in 0.6 M NaCl after short (1-h) long (30-day) exposure periods. employed solidification allowed production samples a wide range secondary dendrite arm spacing (SDAS) while preserving Si phases. 0.5 wt.% led growth AlFeSi(Ni) AlFeSi(Co) phases, but no binary AlNi nor AlCo intermetallic particles have generated. Potentiodynamic polarization studies at early revealed an increase potential as was added for fast slow samples. electrochemical impedance spectroscopy demonstrated that Ni-modified alloy, on other hand, associated smaller charge transfer resistances, indicating reduction resistance elapsed time into electrolyte. However, 30-day tests much lower rate alloy than alloys, rates Co-modified non-modified similar. In Ni-containing decreased under long-term process attributed formation thick dense alumina layer, effectively protecting surface such conditions. This work contributes better knowledge Ni- Co-corrected Al industrial scrap compositions.
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ژورنال
عنوان ژورنال: Metals
سال: 2022
ISSN: ['2075-4701']
DOI: https://doi.org/10.3390/met12040645