摘要
采用铸造法制备6种不同Al/Ga比的Al-Mg-Ga-Sn合金。研究该类合金在模拟海水(质量分数3.5%NaCl)中,30、50、70和90℃下的制氢行为,定量分析产氢速率、产氢量、能量密度和转化率。从组织结构和电化学角度进行了定性分析。采用XRD结合SEM分析发现:Al-Mg-Ga-Sn合金主要组成相为Alss(铝基固溶体)、Mg2Sn和Ga5Mg2。Al-Mg-Ga-Sn合金/海水反应产物除NaCl外,30~70℃时产物为Alss、Mg2Sn和Al(OH)3;90℃时产物为Alss和AlO(OH)。室温下,Al-Mg-Ga-Sn合金在3.5%NaCl溶液中的极化电阻随Al/Ga比值增大逐渐增大;且腐蚀电流与组织结构相关。在90℃和Al/Ga=8/1时,产氢速率19.36 mL/(min·g),产氢量1.156×103 mL/g,能量密度3.515×1010 J/m3,转化率达97.6%。
Al-Mg-Ga-Sn alloys with six different Al/Ga mass ratios were prepared by casting.The hydrogen production behavior of these alloys in simulated seawater(3.5 wt%NaCl)at 30,50,70 and 90℃was investigated;Quantitative analysis of hydrogen production rate,hydrogen yield,energy density and conversion rate,and qualitative analysis of microstructure and electrochemical performance were conducted.XRD analysis combined with SEM observation reveals that the phases of Al-Mg-Ga-Sn alloys are Alss(Al-based solid solution),Mg2Sn and Ga5Mg2.In addition to NaCl,the reaction products of Al-Mg-Ga-Sn alloy/seawater include Alss,Mg2Sn and Al(OH)3 at 30~70℃,whereas Alss,and AlO(OH)at 90℃.The polarization resistance of Al-Mg-Ga-Sn alloy in the 3.5 wt%NaCl solution at room temperature gradually increases with the increases of Al/Ga ratio,and the corrosion current is related to the microstructure.At 90℃and Al/Ga=8/1,hydrogen production rate is 19.36 mL/(min·g),hydrogen yield is 1.156×103 mL/g,energy density is 3.515×1010 J/m3,and conversion rate is up to 97.6%.
作者
张建斌
焦凯
高计计
容煜
石玗
Zhang Jianbin;Jiao Kai;Gao Jiji;Rong Yu;Shi Yu(State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals,Key Laboratory of Non-ferrous Metals Alloys and Processing,Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2020年第10期3582-3589,共8页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51561021)
甘肃省基础研究创新群体(17JR5RA107)。
关键词
铝合金
模拟海水
制氢
腐蚀电流
aluminum alloy
simulated seawater
hydrogen production
corrosion current
作者简介
Corresponding author:张建斌,男,1972年生,博士,副教授,兰州理工大学材料科学与工程学院,甘肃兰州730050,电话:0931-2973563,E-mail:jbzhangjb@hotmail.com。
