模具技术2018.No.4
文章编号：1001-4934(2018)04-0001-07
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脉冲电流频率对退火态TC4钛合金耐腐蚀性能的影响
姜军，李细锋，陈军
（上海交通大学塑性成形技术与装备研究院，上海200030）
摘要：通过盐雾测试和微观分析研究了不同频率的脉冲电流处理对于退火态TC4 钛合金耐腐蚀性能的影响规律。结果表明：盐雾对TC4钛合金的主要腐蚀方式为点腐蚀，随着脉冲电流频率的增加，TC4钛合金的耐腐蚀性能呈现出先变好后变差的趋势，其中获得最优耐腐蚀性能的脉冲频率为200Hz，此时的电压为50V，通电时间为 1min，在该条件下处理得到的TC4钛合金耐腐蚀等级可达到9，而未经处理的原始退火态TC4钛合金耐腐蚀等级仅为5。再结晶和相变决定了TC4钛合金脉冲电流处理前后的耐腐蚀性能。
关键词：TC4钛合金；脉冲电流；频率；耐腐蚀性能
中图分类号：TG146.2+3
文献标识码：A
Effect of pulse current frequency on corrosion resistance of annealed TC4 titanium alloys
JIANG Jun,LI Xi-feng, CHEN Jun
Abstract: The effect of pulsc currcnt treatment with different frequencics on corrosion re sistance of anncaled TC4 titanium alloy was studied by means of salt spray test and micro scopic analysis. The results indicate that pitting corrosion is the main corrosion mode when TC4 alloys are in salt spray environment. With the incrcasc of pulse current frequency, cor rosion resistance of TC4 titanium alloy firstly becomes better and then gets bad. To obtain optimal corrosion resistance, the frequcncy, voltage and processing time are 200 Hz, 50 V and 1 min respectively. The corrosion resistance grade of TC4 titanium alloy can rise to grade 9 under this processing condition,but the corrosion resistance grade ofuntreated orig inal TC4 alloys is only 5 by contrast. The corrosion resistance of TC4 titanium alloys before and after processing with pulse current is determined by the recrystallization and phase transformation
Key words:TC4 titanium alloys; pulse current; frequency; corrosion resistance
性能强等优良的综合性能，在航空航天、汽车、
0引言
钛合金具有比强度高、高温性能好、耐腐蚀收稿日期：2018-01-03
基金项目：航空科学基金资助项目（20163657004)。
作者简介：姜军（1992一），男，硕士研究生。万方数据
船建、电气、生物医学、能源化工等行业应用广泛(1-5]。但是TC4钛合金室温塑性差，在成形时容易引发开裂、回弹等一系列缺陷，使其应用受