The Effect of Heat Treatment on Corrosion Behavior of Low-Ni alloy Steels in CO2 Corrosion
The microstructures and mechanical properties (tension strength Rm,yield strength Rt0.5 and impact energy Akv)of the low-Ni alloy steels 08Ni, 12CrNi and 20CrNi with and without heat treatment were measured and analyzed.The results indicate that the mechanical properties of the lowNi alloy steels with heat treatment are superior compared to other test materials,in the sequence as follows: (20CrNi) > (12CrNi) > (08Ni) >20CrNi > 12CrNi > X60 > 08Ni > 16Mn.The weight loss method was used to test the corrosion rates of the test materials exposed to a simulated oilfield environment for 168 h at 90℃ with the CO2 partial pressure and total pressure 2 MPa and 10 MPa respectively.The systematical characterization with SEM and X-ray diffraction (XRD) displayed the different micro-morphology of corrosion scale formed on surface of the test materials with FeCO3 as the only detected composition of corrosion product.The corrosion behavior of the low-Ni alloy steels with heat treatment showed higher corrosion resistance than other test materials, mainly resulted from the different microstructures of the matrix, the characteristic of corrosion scale and the composition of elements.
Low-Ni-alloy steel Heat treatment CO2 corrosion Corrosion scale XRD
WANG Hong-yan BAI Zhen-quan
The Key laboratory for mechanical and Environmental Behaviromental Behavior of Tubular Goods,CNPC,Xi”an 710065,P,R.China
国内会议
西安
英文
167-175
2014-05-01（万方平台首次上网日期，不代表论文的发表时间）