Details

Autor(en) / Beteiligte

• Zhang, Yasi
• Wang, Richu
• Peng, Chaoqun
• Chen, Yusi
• Wang, Xiaofeng
• Cai, Zhiyong
• Feng, Yan

Titel

Influence of cooling rate on the corrosion behavior of Al–Zn–In–Mg–Ag sacrificial anode

Ist Teil von

• Journal of materials research and technology, 2024-05, Vol.30, p.1207-1216

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• The cooling curves of the Al–Zn–In–Mg–Ag alloys in copper mold, iron mold, and 400 °C-preheated iron mold cast were simulated and three solidification rates were calculated to be 7.05 °C/s, 0.76 °C/s, and 0.28 °C/s. The effects of cooling rate on the microstructure, electrochemical characteristics, and corrosion morphologies of Al–Zn–In–Mg–Ag alloys are investigated. The results demonstrate that the alloy with a low cooling rate has the lowest self-corrosion rate (0.09 mm/year), the highest actual capacity (2503.16 Ah/Kg2), as well as the highest anode current efficiency (87.46%). The anode current efficiency of the Al alloys is affected by the self-corrosion and the detachment of the second phases and grains. As the cooling rate decreases, the grain size becomes larger, the amount of the MgZn2 second phase decreases, and the content of In, Zn, and Ag activation elements increases in the matrix. The corrosion of the Al–Zn–In–Mg–Ag alloy initiates from the micro-galvanic corrosion between the MgZn2 second phase and the Al matrix. It then extends along the grain boundaries and towards the intragranular, accompanied by the shedding of the MgZn2 particles and the grains. [Display omitted] •The solidification rates of the three casting parameters are 7.05 °C/s, 0.76 °C/s and 0.28 °C/s calculated by simulation.•The relationship between the solidification rate and SDAS of Al–Zn–In–Mg–Ag follows formula D = 48.95 V−1/3.•The corrosion initiates between MgZn2 and the matrix, then extends along the grain boundaries and towards the intragranular.•The anode with a low cooling rate has the highest current efficiency.