不锈钢中诱发局部腐蚀的贫Cr区研究进展

史伟宁,杨树峰,李京社

Correlation Between Cr-depleted Zone and Local Corrosion in Stainless Steels: A Review

Weining SHI,Shufeng YANG,Jingshe LI

表1 不锈钢中贫Cr区的检测方法

Table 1 Methods of studying Cr-depleted zone

Object Method Information Composition FIB/SIMS[16,17,18,19,25,28] The composition at micro area adjacent to inclusions accurately Crystal structure, composition, morphology TEM[17,18,19,26,27,28,29,38,53,57,60,61,62] The composition accurately and quantitatively in nano area Composition AES[21,63] The composition accurately in microscale area Morphology, composition SEM[21,25,28,32,33,38,53,58,60,61,62,64] In situ observation of corrosion morphology Current distribution, Composition SECM[63] Surface information and local Ferrari current map of materials Composition EPMA[32,33,57] The trace amount Depth of pits AFM[53,63] The depth of pits The corrosion behavior of single inclusion Microscale potentiodynamic polarization[25,53] Pitting potential, corrosion current density The corrosion behavior of specimen or inclusion Macroscale potentiodynamic polarization[25,32] Pitting potential, corrosion current density The metastable pitting of inclusions Potentiostatic polarization[32] The number of metastable pitting The morphology of grain/grain boundaries or inclusion Immersion tests[21] Corrosion morphology of grain/grain boundaries or inclusions The degree of sensitization (DOS) DLEPR[33,61,64] Ir/Ia＜2%, no; 2~8%, little; 8~30%, weak and medium; ＞30%, severe The corrosion resistance of specimen OCP[61] Variation of open-circuit voltage with time