Effect of Simulated Annealing Conditions on Scale Formation and Neutral Electrolytic Pickling,Steel Research International

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Effect of Simulated Annealing Conditions on Scale Formation and Neutral Electrolytic Pickling
Steel Research International ( IF 1.9 ) Pub Date : 2020-11-14 , DOI: 10.1002/srin.202000449
Susanna Airaksinen ₁ , Teemu Tuovinen ₂ , Aleksi Laukka ₁ , Tero Vuolio ₁ , Eetu‐Pekka Heikkinen ₁ , Elina Riekki ₃ , Timo Manninen ₃ , Timo Fabritius ₁

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Scale formation of AISI 304 stainless steel during annealing at temperatures between 1100 and 1200 °C under a water vapor‐containing atmosphere is studied. Characterization of the oxide scale is performed with field‐emission scanning electron microscopy–energy dispersive spectroscopy (FESEM–EDS) and glow discharge optical emission spectroscopy (GDOES) and removal of oxide scale is done via neutral electrolyte pickling. The pickling conditions are kept constant and the effect of the annealing conditions and scale properties on the pickling result are examined. The effectiveness of pickling is evaluated using analysis FESEM images taken on polished sections of pickled surfaces. Research shows that the thickness, morphology, and composition of the oxide scale are dependent on annealing temperature and time. The thicknesses of the scale formed under the established conditions vary from 0.2 to over 30 μm, and morphologies between the chromium rich oxide layer and layered scale structure formed by breakaway oxidation. The pickling response of oxide scales remains good at all annealing temperatures with the shortest exposure time.

中文翻译：

模拟退火条件对水垢形成和中性电解酸洗的影响

研究了AISI 304不锈钢在1100至1200°C的温度下在含水蒸气的气氛下退火过程中产生的水垢。使用场发射扫描电子显微镜-能量色散光谱法（FESEM-EDS）和辉光放电光发射光谱法（GDOES）进行氧化皮的表征，并通过中性电解液酸洗去除氧化皮。酸洗条件保持恒定，并检查退火条件和氧化皮性质对酸洗结果的影响。使用在酸洗表面的抛光部分上拍摄的分析FESEM图像评估酸洗的有效性。研究表明，氧化皮的厚度，形态和组成取决于退火温度和时间。在既定条件下形成的氧化皮的厚度从0.2μm到超过30μm不等，并且富铬氧化物层和通过分离氧化形成的层状氧化皮结构之间的形态。在所有退火温度下，氧化皮的酸洗响应时间都最短，暴露时间最短。

更新日期：2020-11-14

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