电化学噪声法研究钛合金在硝酸羟铵基推进剂中的腐蚀行为  

Corrosion Behavior of Titanium Alloy in Hydroxylammonium Nitrate(HAN)Based Propellant Using Electrochemical Noise Technology

作　　者：唐占梅 彭峥 郭伟[1] 鲍世国[1] 孙海云[1] 张晓亮[2] TANG Zhanmei;PENG Zheng;GUO Wei;BAO Shiguo;SUN Haiyun;ZHANG Xiaoliang(Aerospace Liquid Propellant Research Center,Beijing Institute of Aerospace Testing Technology,Beijing 100074,China;Beihang University,Beijing 100191,China)

机构地区：[1]北京航天试验技术研究所航天液体推进剂研究中心,北京100074 [2]北京航空航天大学,北京100191

出　　处：《材料保护》2025年第3期40-48,共9页Materials Protection

摘　　要：硝酸羟铵(HAN)基推进剂是一种新型绿色推进剂,其与航天传统结构材料钛合金的相容性研究有待深入。采用电化学噪声(EN)方法以及扫描电镜(SEM)、X射线光电子能谱(XPS)等分析手段研究了TC4钛合金在HAN基推进剂中长周期腐蚀变化规律。结果表明:随着浸泡时间的延长,电位噪声平均值和电流噪声平均值变化趋势反映了母材和焊材试样发生了活性腐蚀-氧化膜形成-腐蚀平衡过程;此外,母材和焊材的电位噪声标准偏差均在浸泡1 d时达到最大值,分别为5.92、6.02,焊材试样的电位噪声标准差值比母材略大,焊材的腐蚀活性比母材略高;TC4在碱性HAN基推进剂中浸泡65 d过程中,功率谱密度(PSD)曲线高频区斜率始终保持在-1 dB/dec左右,远大于-20 dB/dec,这与TC4合金在碱性HAN基推进剂中发生很强的局部腐蚀行为一致;TC4的合金元素Al在HAN基推进剂腐蚀过程中在表面形成Al_(2)O_(3)和Al(OH)_(3),而合金元素Ti的氧化物与碱性的HAN介质发生反应形成可溶解的盐类物质,从而使得TC4钛合金在碱性HAN基推进剂中不能形成稳定致密的钝化膜。Hydroxylammonium nitrate(HAN)-based propellant is a new type of green propellant.The compatibility of HAN-based propellants with traditional aerospace structural materials,such as titanium alloys,requires further investigation.The corrosion behavior of TC4 titanium alloy in HAN-based propellant was studied over long periods using electrochemical noise(EN)methods,along with scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),and other analytical techniques.Results showed that,with the extension of immersion time,the average values of potential noise and current noise reflected the process of active corrosion-oxide film formation-corrosion equilibrium occurring in both the base material and welded material samples.Moreover,the standard deviation of potential noise in both base material and welded material reached its maximum on the first day of immersion,at values of 5.92 and 6.02,respectively.The standard deviation of potential noise in the welded material was slightly higher than that in the base material,indicating a slightly higher corrosion activity in the welded material.During the 65 d immersion of TC4 in alkaline HAN-based propellant,the slope of the power spectral density(PSD)curve in the highfrequency region remained at approximately-1 dB/dec,far greater than-20 dB/dec,which was consistent with the strong localized corrosion behavior of TC4 alloy in alkaline HAN-based propellant.The alloy element Al in TC4 formed Al_(2)O_(3)and Al(OH)_(3)on the surface during the corrosion process in HAN-based propellant,while the oxide of the alloy element Ti reacted with the alkaline HAN medium to form soluble salts,preventing the formation of a stable and dense passivation film on TC4 titanium alloy in alkaline HAN-based propellant.

关 键 词：电化学噪声 TC4钛合金 硝酸羟铵 推进剂 腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]