脉冲电流频率对退火态TC4钛合金耐腐蚀性能的影响
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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。
The effect of pulse current treatment with different frequencies on corrosion resistance of annealed TC4 titanium alloy was studied by means of salt spray test and microscopic analysis.The results indicate that pitting corrosion is the main corrosion mode when TC4 alloys are in salt spray environment.With the increase of pulse current frequency,corrosion resistance of TC4 titanium alloy firstly becomes better and then gets bad.To obtain optimal corrosion resistance,the frequency,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 of untreated original 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.
The effect of pulse current treatment with different frequencies on corrosion resistance of annealed TC4 titanium alloy was studied by means of salt spray test and microscopic analysis.The results indicate that pitting corrosion is the main corrosion mode when TC4 alloys are in salt spray environment.With the increase of pulse current frequency,corrosion resistance of TC4 titanium alloy firstly becomes better and then gets bad.To obtain optimal corrosion resistance,the frequency,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 of untreated original 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.
引文
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[2]BREWER W D,BIRD R K,WALLACE T A.Titanium alloys and processing for high speed aircraft[J].Materials Science and Engineering A,1998,243(1-2):299-304.
[3]刘国怀,李天瑞,徐莽,等.累积叠轧TC4钛合金的组织演化与力学性能[J].金属学报,2017,53(9):1038-1046.
[4]EZUGWU E O,WANG Z M.Titanium alloys and their machinability-a review[J].Journal of Materials Processing Technology,1997,68(3):262-274.
[5]龚从扬.钛合金板料先进成形制造技术研究进展[J].模具技术,2017(6):48-53.
[6]赵达,董湘怀,谢焕阳,等.AZ31镁合金电塑性流动应力模型[J].模具技术,2013(3):7-12.
[7]CONRAD H,WHITE J,CAO W D,et al.Effect of electric current pulses on fatigue characteristics of polycrystalline copper[J].Materials Science and Engineering A,1991,145:1-12.
[8]LAI Z H,MA C X,CONRAD H.Cyclic softening by high density electric current pulses during low cycle fatigue ofα-Ti[J].Scripta Metallurgica Et Materialia,1992,27:527-530.
[9]LEVITIN,LOSKUTOV S V.The effect of a current pulse on the fatigue of titanium alloy[J].Solid State Communication,2004,131:181-183.
[10]肖素红,韩恩厚,郭敬东.脉冲电流处理对X70管线钢腐蚀性能的影响[J].材料研究学报,2006,20(1):1-4.
[11]刘杨,王磊,冯飞,等.脉冲电流处理对GH3044合金组织及腐蚀行为的影响[J].钢铁研究学报,2011,23(增刊2):80-83.
[12]秦勇.脉冲电流对化学镀Ni-P合金性能的影响[J].腐蚀与防护,1991(3):120-122.
[13]王少楠,唐国翌,徐卓辉,等.电轧AZ31镁合金在模拟海水中腐蚀行为研究[J].材料科学与工艺,2010,18(3):339-343.
[14]沈桂琴,彭益群.Ti-15Mo-2.7Nb-3Al-0.2Si高强钛合金的相变[J].材料工程,1999(3):19-23.
[15]杨亮,魏承炀,雷力明,等.两相钛合金再结晶退火组织与织构演变的蒙特卡罗模拟[J].物理学报,2013,62(18):340-348.
[16]王少楠.电脉冲对AZ31镁合金冲压性能和腐蚀性能的影响[D].北京:清华大学,2009.