Observation of natural convection and particle ejection from stainless steel single pits

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2024-10-16 DOI:10.1016/j.corsci.2024.112518

Lindsay Grandy , Robert Lacasse , Jonathan Ralph Adsetts , Christophe Hitz , Danny Chhin , Janine Mauzeroll

引用次数: 0

Abstract

Single pits were visually and electrochemically followed during their growth on a S41500 martensitic SS microelectrode. Solid particles were observed ejecting from the growing pit and after extraction, EDX determined they were mostly iron-based hydroxides/oxides. These particles were carried by fluid flow originating from the pit at a velocity of 21 μm/s. Finite element modeling confirmed the observed flow speeds are achievable by natural convection due to metal ion density gradients. While the pit solution does not experience flow, the bulk solution pH was observed to decrease illustrating how natural convection affects the bulk solution chemistry.

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观察不锈钢单坑的自然对流和颗粒喷射

对 S41500 马氏体 SS 微电极上的单个凹坑的生长过程进行了目测和电化学跟踪。观察到固体颗粒从生长的凹坑中喷出，提取后，EDX 确定它们主要是铁基氢氧化物/氧化物。这些颗粒被从凹坑中喷出的流体以 21 μm/s 的速度带走。有限元建模证实，由于金属离子密度梯度，自然对流可以达到观测到的流速。虽然矿坑溶液没有流动，但观察到溶液的 pH 值降低，这说明自然对流如何影响溶液的化学性质。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.