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首页> 外文期刊>RSC Advances >Corrosion behavior of 316L and 304 stainless steels exposed to industrial-marine-urban environment: field study
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Corrosion behavior of 316L and 304 stainless steels exposed to industrial-marine-urban environment: field study

机译：316L和304不锈钢暴露于工业海上城市环境的腐蚀行为：田间研究

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The present investigation extensively compares the pitting corrosion behavior and mechanical stability of 316L and 304 stainless steels (SS) exposed to an Industrial-Marine-Urban (IMU) environment for 3 years from April 2012–March 2015. The surface morphology of the stainless steels exposed to the above environment was studied by atomic force microscopy (AFM) and scanning electron microscopy equipped with energy dispersive X-ray analysis (SEM-EDAX). Mechanical stability of the exposed samples was monitored by the Vickers microhardness test. Corrosion behavior of exposed samples was monitored by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization studies. FT-Raman spectroscopy was employed for investigation of the atmospheric corrosion products; this offered much interesting information that eventually helped to understand the various corrosion phenomena that had occurred during the periods of 3, 6, 9, 12, 24, and 36 months to identify corrosion products which could not be evaluated from XRD analysis. The experimental results clearly show that both 316L and 304 SS were affected by pitting corrosion from the dissolution of Mn present in the alloy due to atmosphere electrolytes. Pit initiation occurs with the high amount of Cl ~(?) present as a highly corrosive agent. Hence, high pit density was observed in 304 because of the selective dissolution as MnS present in the alloying elements. However, presence of SO _(2) in the atmospheric location enhances pitting corrosion resistance by inducing a stable rust layer (Goethite) to form. Meteorological data and weight loss results clearly demonstrated that decreases in corrosion rate (which was due to the formation of a highly adherent passive film) occur remarkably during the dry season. The present investigation has observed a very high relative humidity (RH) value in the Chennai region of India. Very high RH reveals the presence of a thick water layer on the metal surface which acts as a sink to form the passive film. The electrochemical studies of atmospherically corroded 316L SS depicts passivation behavior whereas the 304 SS does not show any passivation behavior in the IMU region of Chennai.
机译：本着从2012年4月至2015年4月，广泛地将316L和304不锈钢（SS）暴露于工业海上城市（IMU）环境的蚀腐蚀行为和机械稳定性。不锈钢的表面形态通过原子力显微镜（AFM）和扫描电子显微镜研究，与能量分散X射线分析（SEM-EDAX）进行了接触到上述环境。通过维氏微硬度测试监测暴露样品的机械稳定性。通过电化学阻抗光谱（EIS）和电位偏振研究监测出暴露样品的腐蚀行为。 FT-拉曼光谱用于调查大气腐蚀产品;这提供了许多有趣的信息，最终有助于了解在3,6,9,12,24和36个月内发生的各种腐蚀现象，以确定无法从XRD分析评估的腐蚀产品。实验结果清楚地表明，由于大气电解质，通过从合金中存在的Mn溶解的腐蚀，316L和304SS都受到腐蚀的影响。坑引发发生在作为高腐蚀剂的大量Cl〜（β）中发生。因此，由于合金元素中存在的MnS，因此在304中观察到高凹坑密度。然而，通过诱导稳定的防锈层（甲酸酯）形成致密的耐腐蚀性，使得如此_（2）增强了蚀性耐腐蚀性。清楚地证明了气象数据和减肥结果，减少腐蚀速率（由于形成高度粘附的无源膜）在干燥季节中出现显着发生。本研究在印度钦奈地区观察了一个非常高的相对湿度（RH）价值。非常高的RH显示在金属表面上的厚水层的存在，其用作水槽以形成被动膜。大气腐蚀316LS的电化学研究描绘了钝化行为，而304 SS不会在Chennai的IMU区域中显示任何钝化行为。

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