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首页> 外文期刊>Applied Surface Science >High temperature oxidation behavior of AISI304L stainless steel-Effect of surface working operations
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High temperature oxidation behavior of AISI304L stainless steel-Effect of surface working operations

机译：AISI304L不锈钢的高温氧化行为-表面加工操作的影响

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摘要

The oxidation behavior of grade 304L stainless steel (SS) subjected to different surface finishing (machining and grinding) operations was followed in situ by contact electric resistance (CER) and electrochemical impedance spectroscopy (EIS) measurements using controlled distance electrochemistry (CDE) technique in high purity water (conductivity < 0.1 μS cm~(-1)) at 300℃ and 10 MPa in an autoclave connected to a recirculation loop system. The results highlight the distinct differences in the oxidation behavior of surface worked material as compared to solution annealed material in terms of specific resistivity and low frequency Warburg impedance. The resultant oxide layer was characterized for (a) elemental analyses by glow discharge optical emission spectroscopy (GDOES) and (b) morphology by scanning electron microscopy (SEM). Oxide layers with higher specific resistivity and chromium content were formed in case of machined and ground conditions. Presence of an additional ionic transport process has also been identified for the ground condition at the metal/oxide interface. These differences in electrochemical properties and distinct morphological features of the oxide layer as a result of surface working were attributed to the prevalence of heavily fragmented grain structure and presence of martensite.
机译：在304L不锈钢（SS）进行不同的表面精加工（机械加工和磨削）后，其氧化行为采用接触电阻（CER）和电化学阻抗谱（EIS）在现场采用可控距离电化学（CDE）技术进行测量。在与循环回路系统连接的高压釜中，在300℃和10 MPa下的高纯水（电导率<0.1μScm〜（-1））。结果表明，在电阻率和低频Warburg阻抗方面，与固溶退火材料相比，表面处理材料的氧化行为存在明显差异。将所得的氧化物层表征用于（a）通过辉光放电光发射光谱法（GDOES）的元素分析和（b）通过扫描电子显微镜（SEM）的形态。在机械和地面条件下，会形成具有较高电阻率和铬含量的氧化物层。对于金属/氧化物界面的地面条件，也已经确定存在其他离子传输过程。表面处理的结果是，这些电化学性能的差异和氧化物层的独特形态特征归因于普遍存在严重破碎的晶粒结构和马氏体的存在。

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