摘要
用称重法、电化学方法以及做成元件实用考核等办法，研究了锐基波纹膜片材料（Ｎｂ－１～５Ｍｏ－１～３Ｚｒ－≤４Ｔｉ）抗蚀性能。试验结果如下：在１００～１２６℃浓醋酸、次氯酸钠、海水以及干在湿氧气中，没泡１～２年后，该合金试片表面仍光亮，未发现任何腐蚀斑点。根据试验前后重量变化，计算出的腐蚀速率很低（１０￣（－４）～１０￣（－５）ｍｍ／年）。该合金波纹膜片装入差压变送器中，在上述介质中使用２年后，波纹膜片仍光亮，未出现任何受腐蚀的痕迹，而且，变送尽的精度始终保持优于０．５好。电化学实验证明：该合金在含Ｃ￣（－）离子介质中具有很高的钝性，钝态区宽度≥２Ｖ，产生点蚀的临界电位＞１．７Ｖ；该合金自然浸泡在含Ｃｌ￣（－）离子介质中可自发地形成钝化膜，而且当钝化膜被磨损后能迅速自行修复。
In this paper,recorrosive property ofNb-base alloy(Nb-1～5Mo-1～3Zr-≤4Ti)used ascorrugate-plate was evaluated by means of weighing,electric chemistry and active effectiveness of usagefor instrument in chemical engineering,The experimental results were as follows:After thesamples of the alloy had been soaked respectively inseveral mediums(dense acetic acid at 100～126 ℃,sodium hypochlorite,sea water and dry or humidchlorine gas)for 1～2 years,all of them were brightand corrosive spots on them were not discovered.Corrosion rate calculated according to the change of weight was very low(10￣(-4)～10￣(-5)mm/year).After corrugated membrane of the alloy installed in capsule of differential transformer had been used in abovemedium for 2 years,the surface of the testedmembrane was still bright and corrosive traces on itwere not exhibited. Moreover the precision of thetransformer always remained superior to 0.5 order.Electric chemistry experimentals proved that the Nb-base alloy in medium containing Cl￣(-) ion possessedvery high bluntness,width of blunt region≥2volt,critical potential of the Nb-base alloy for producingcorrosive spots was higher than 1.7 voIt,and on theNb-base alloy soaking in medium containing Cl￣(-)ioncould naturally form blunt film. Furthermore,theblunt film could be rapidly repaired by itself afterbeing abrased.
出处
《功能材料》
EI
CAS
CSCD
1995年第3期261-264,共4页
Journal of Functional Materials
