CN110196184A - 一种储罐底板钢点蚀在线声发射-电化学联合实验装置 - Google Patents
一种储罐底板钢点蚀在线声发射-电化学联合实验装置 Download PDFInfo
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Abstract
本发明公开了一种储罐底板钢点蚀在线声发射‑电化学联合实验装置,包括饱和甘汞电极、有机玻璃电解池、支座、缓震橡胶垫、声发射传感器、金属试件、带孔隔板、Pt电极和腐蚀溶液。饱和甘汞电极和直盐桥组成参比电极,固定于有机玻璃电解池中,有机玻璃电解池放置于支座上方,其内装有腐蚀溶液,声发射传感器通过耦合剂紧密贴合在金属试件背面,实时接收来自工作面产生的腐蚀信号,金属试件采用线切割加工成正方形小块,作为工作电极;Pt电极作为辅助电极,声发射和电化学测试系统分别用于采集试件的腐蚀声发射信号和腐蚀电化学参数。本发明可用于实时原位监测金属试件的点蚀状况,保证金属试件点蚀特征的准确性并可方便拆洗,可重复使用。
Description
技术领域
本发明涉及实验设备技术领域,特别是涉及一种储罐底板钢点蚀在线声发射-电化学联合实验装置。
背景技术
常压储罐底板的腐蚀过程相当复杂,通常表现为大面积均匀腐蚀、局部点蚀、特殊位置的应力腐蚀甚至多种腐蚀类型之间的耦合,均匀腐蚀通常导致底板大范围均匀减薄和变形,而局部点蚀对储罐的危害性更大,其腐蚀速率远远大于均匀腐蚀的平均腐蚀速率,严重时导致储罐底板腐蚀穿孔,引发原油泄漏事故,威胁到储罐的运行安全。点蚀受其局部特殊环境的影响,往往处于高活性状态,能够产生明显的声发射信号。
因此,通过建立实验室声发射-电化学联合测试装置,在酸性氯化钠溶液中研究底板钢试样点蚀过程产生声发射信号的特征。采用声发射参数分析、波形分析和小波分析方法,并结合电化学参数变化特点,探讨底板钢点蚀声发射信号的规律,提取信号特性参数值(或范围)和频谱特征,为储罐底板腐蚀特征识别奠定基础。
发明内容
本发明的目的是提供一种储罐底板钢点蚀在线声发射-电化学联合实验装置,通过声发射传感器实时监测金属试件在腐蚀溶液中的点蚀波形特征,使装置能够保证金属试件点蚀特征的准确性并可方便拆装清洗。
为实现上述目的,本发明提供了如下方案:
本发明提供了一种储罐底板钢点蚀在线声发射-电化学联合实验装置,包括饱和甘汞电极、有机玻璃电解池、支座、声发射传感器、金属试件、Pt电极、腐蚀溶液、声发射测试系统和电化学测试系统。所述饱和甘汞电极和直盐桥组成参比电极,固定于有机玻璃电解池中,所述有机玻璃电解池放置于所述支座上方,其内装有腐蚀溶液,所述声发射传感器通过耦合剂紧密贴合在金属试件背面,实时接收来自工作面产生的腐蚀信号,所述金属试件采用线切割加工成正方形小块,所述Pt电极作为辅助电极,所述声发射测试系统和电化学测试系统分别用于采集分析金属试件的腐蚀信号和腐蚀电流。
优选地,还包括缓震橡胶垫,所述缓震橡胶垫分别设置于所述有机电解池下方和所述支座下方。
优选地,还包括带孔隔板,所述带孔隔板安装于有机玻璃电解池内部隔开参比电极和辅助电极,隔板底部均布有4个Φ9mm的小圆孔,尽可能减少氢气泡活动对试件腐蚀信号的干扰。
优选地,所述金属试件为正方形小块,采用金相砂纸打磨至镜面光亮,去离子水清洗表面杂质,再用丙酮去除表面油脂,无水乙醇擦拭后放入干燥器干燥,最后采用环氧树脂将试片四周面密封。
本发明相对于现有技术取得了以下技术效果:
本发明提供了一种储罐底板钢点蚀在线声发射-电化学联合实验装置,可用于实时原位监测金属试件的点蚀状况。本发明中的饱和甘汞电极、Pt电极、有机玻璃电解池、支座、声发射传感器、金属试件、声发射测试系统和电化学测试系统都可循环利用,方便拆装,便于使用和清洁,可提高实验效率和实验结果准确性。
附图说明
为了更清楚地说明本发明实施例和现有技术中的技术方案,下面将对实施中所需要使用的附图做简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为本发明点蚀实验系统结构示意图;
其中:1-饱和甘汞电极,2-有机玻璃电解池,3-支座,4-缓震橡胶垫,5-声发射传感器,6-金属试件,7-带孔隔板,8-Pt电极,9-腐蚀溶液。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明的一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有付出创造性劳动的前提下所获得的所有其他实施例,都属本发明保护的范围。
本发明的目的是提供一种储罐底板钢点蚀在线声发射-电化学联合实验装置,通过声发射系统和电化学测试系统实时反映金属试件的腐蚀特征和腐蚀电流,使装置能够保证金属试件点蚀特征的准确性并可方便拆装清洗。
为使本发明的上述目的、特征和优点能够更加明显易懂,下面结合附图和具体实施方式对本发明做进一步详细的说明。
如图1所示,本实施例提供了一种储罐底板钢点蚀在线声发射-电化学联合实验装置,包括饱和甘汞电极1、有机玻璃电解池2、支座3、缓震橡胶垫4、声发射传感器5、金属试件6、带孔隔板7、Pt电极8和腐蚀溶液9。
有机玻璃电解池2设置于支座3上方,内装有腐蚀溶液9,饱和甘汞电极1和Pt电极8分别固定在有机玻璃电解池上面板,与电化学测试系统相连接,由饱和甘汞电极和直盐桥组成参比电极体系,铂片电极作为辅助电极,支座3与有机玻璃电解池之间和支座3与地面之间均采用缓震橡胶垫4隔开,避免外界震动对声发射数据采集的影响,声发射传感器5与声发射测试系统连接,对金属试件的腐蚀信号进行采集分析。
金属试件6作为工作电极,采用线切割加工成正方形小块,大小为29mm×29mm,厚度2±0.1mm,依次采用320-1200#金相砂纸打磨至镜面光亮,去离子水清洗表面杂质,再用丙酮去除表面油脂,无水乙醇擦拭后放入干燥器,干燥后称重。最后采用环氧树脂将试片四周面密封,上下表面裸露,在耦合面一侧边角处焊接导线,试件上表面为工作面,接触腐蚀溶液,下表面将与声发射传感器耦合,接收来自工作面产生的腐蚀信号。
带孔隔板7隔开参比电极和辅助电极,隔板底部均布有4个Φ9mm的小圆孔,以确保隔板两边腐蚀溶液完全导通,使得氢气泡只在铂电极一侧生成,对试样一侧溶液几乎没有扰动,对试片表面本身的干扰也极小,便于采集点蚀过程的声发射信号。
腐蚀溶液9采用质量分数3.0%NaCl、pH=2.0的酸性溶液,其中3.0%NaCl溶液采用分析纯NaCl和去离子水配制,用精度为0.01的pH计监测溶液的酸碱度,采用0.1mol/L的稀HCl调节pH值至2.0,配制腐蚀溶液量3000ml。
本实施例的使用方法为:对金属试件6进行点蚀实验时,首先对试件进行打磨加工,试件上表面接触腐蚀溶液9,下表面与声发射传感器5良好耦合,试件边缘与有机玻璃电解池2之间密封良好,放置于底部支座3上方,当金属试件发生腐蚀时,通过声发射测试系统和电化学测试系统监测腐蚀信号和腐蚀电流等特征。
本说明书中应用了具体个例对本发明的原理及实施方式进行了阐述,以上实施例的说明只是用于帮助理解本发明的方法及其核心思想;同时,对于本领域的一般技术人员,依据本发明的思想,在具体实施方式及应用范围上均会有改变之处。综上所述,本说明书内容不应理解为对本发明的限制。
Claims (4)
1.一种储罐底板钢点蚀在线声发射-电化学联合实验装置,其特征在于:包括饱和甘汞电极、有机玻璃电解池、支座、声发射传感器、金属试件、Pt电极、腐蚀溶液、声发射测试系统和电化学测试系统。所述饱和甘汞电极和直盐桥组成参比电极,固定于有机玻璃电解池中,所述有机玻璃电解池放置于所述支座上方,其内装有腐蚀溶液,所述声发射传感器通过耦合剂紧密贴合在金属试件背面,实时接收来自工作面产生的腐蚀信号,所述金属试件采用线切割加工成正方形小块,所述Pt电极作为辅助电极,所述声发射和电化学测试系统分别用于采集试件的腐蚀声发射信号和腐蚀电化学参数。
2.根据权利要求1所述的储罐底板钢点蚀在线声发射-电化学联合实验装置,其特征在于:还包括缓震橡胶垫,所述缓震橡胶垫分别设置于所述有机电解池下方和所述支座下方。
3.根据权利要求1所述的储罐底板钢点蚀在线声发射-电化学联合实验装置,其特征在于:还包括带孔隔板,所述带孔隔板安装于有机玻璃电解池内部隔开参比电极和辅助电极。
4.根据权利要求1所述的储罐底板钢点蚀在线声发射-电化学联合实验装置,其特征在于:所述金属试件为正方形小块,采用金相砂纸打磨至镜面光亮,去离子水清洗表面杂质,再用丙酮去除表面油脂,无水乙醇擦拭后放入干燥器干燥,最后采用环氧树脂将试片四周面密封。
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