摘要
通过电化学渗氢技术研究了施加不同阴极电位条件下含不同H2S浓度的3.5%NaCl溶液中X70管线钢的氢渗透行为.结果表明,稳态渗氢电流P∞随H2S浓度的增大而逐渐增大,但一定时间内,渗透过试样的氢原子摩尔数并不随之单调增加;氢原子的渗透受到阴极电位的控制,阴极电位越负,渗氢电流越大;在一定电位范围内,稳态渗氢电流P∞和一定时间内渗透过试样的氢原子摩尔数N与阴极电位呈线性关系.扩散系数与试验条件无关.
The hydrogen entry and permeation for X70 grade pipeline steels has been investigated electrochemically using a Devanathan cell with a membrane covered on the exit side by a nickel layer. The tests were conducted in 3.5 % NaCl solution containing various concentration of H2S at various applied potential. The results showed that the steady state permeation current P~ increased with increasing the content of H2S, and the permeated hydrogen atoms N didnt increase monotonously within a definite period of time. The hydrogen entry and permeation depended strongly upon the cathodic potential. The more negative the potential was, the higher the steady state permeation current P∞ was. The steady state permeation current P∞ and the permeated hydrogen atoms N were linear with cathodic potential over a limited range of potential. The diffusion coefficient was determined by the nature of material and metallurgical factors rather than the test conditions.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2005年第5期317-319,共3页
Corrosion Science and Protection Technology
关键词
氢渗透
管线钢
扩散系数
hydrogen permeation
pipeline steel
diffusion coefficient
