杨萍
,
黎学明
,
宗庆彬
,
邱妮
,
姚强
,
苗玉龙
腐蚀科学与防护技术
采用Tafel直线外推法、电化学阻抗谱和中性盐雾腐蚀试验研究了电力系统用LF21铝合金在5% NaCl溶液中的电化学腐蚀行为, 利用SEM和EDS表征材料的腐蚀形态与腐蚀产物组成, 并探讨腐蚀机理. 结果表明, LF21铝合金在5% NaCl溶液中耐蚀性很差. 随着电解液温度升高, 铝合金的自腐蚀电位负移, 腐蚀速率变大. 电化学阻抗谱显示其容抗减小, 膜电容下降, 合金表面的保护膜被破坏. LF21铝合金在NaCl介质中的腐蚀主要以点蚀为主, 形成较深的腐蚀坑, 点蚀部位O含量明显增高.
关键词:
LF21铝合金
,
corrosion
,
NaCl solution
,
electric power system
Rongchang ZENG
,
Enhou HAN
材料科学技术（英）
The corrosion morphologies of aged magnesium alloy AZ80 were investigated by immersion corrosion tests, scanning electron microscopy (SEM), electrochemical measurement. The T5 heat treatment was carried out in a vacuum furnace, holding for 16 h at 177℃, and then cooling in air. The results showed intergranular corrosion (IGC) occurred as an aged AZ80 sample was immersed in 3.5 wt pct NaCl aqueous solution for 1 h and the narrow path attack progressed predominantly along the bulk β phase in the grain boundaries or took place in the eutectic areas. IGC was attributed to the network distribution of β phase along the grain boundaries, the depleted aluminium in the precipitation areas and the breakdown potential.
关键词:
Magnesium alloy
,
null
,
null
,
null
赵凯
,
张丹
,
于龙文
,
赵冰超
,
严俊杰
工程热物理学报
本文搭建了静态闪蒸实验台,对不同初始参数下NaCl溶液静态闪蒸过程中的泡沫层膨胀规律开展了初步地实验研究和理论分析.实验中,过热度为2.9～30 K,初始液膜厚度为0.1m、0.2 m,溶液初始质量分数为0.2～0.25.实验结果表明:在较大的过热度或者较小的初始液膜厚底下,泡沫层膨胀开始较早,且膨胀较快;而溶液浓度对泡沫层膨胀规律几乎没有影响.此外,本文根据气泡生长理论和质量能量平衡建立并推导出了泡沫层膨胀规律计算模型,实现了对泡沫层高度随时间变化规律的计算,与实验结果吻合得较好.
关键词:
静态闪蒸
,
泡沫状沸腾
,
泡沫层膨胀
,
NaCl溶液
