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首页> 外文期刊>International Journal of Electrochemical Science >Influence of Laser Marks on the Electrochemical Behaviour of the ASTM F139 Stainless Steel for Biomedical Application
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Influence of Laser Marks on the Electrochemical Behaviour of the ASTM F139 Stainless Steel for Biomedical Application

机译：激光标记对生物医学用ASTM F139不锈钢的电化学行为的影响

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摘要

The aim of this work is to evaluate the effect of a laser marking technique on the microstructure andchemical composition at the surface of the ASTM F139 stainless steel and the influence of the surfacemodifications on its corrosion resistance. This is one of the most frequently used biomaterial forprosthesis manufacture. The laser effect on the corrosion resistance has been evaluated byelectrochemical techniques, specifically electrochemical impedance spectroscopy. It was found that thelaser marking reduces the corrosion resistance by modification of the microstructure and surfacechemical composition affecting the surface passive layer, comparatively to the unmarked material. Thesurface and chemical composition was analyzed by scanning electron microscope coupled to a high- resolution field emission gun (SEM-FEG) and transmission electron microscopy (TEM) withmicroanalysis. TEM in areas affected by laser engraving showed a very high density of dislocationssuggesting the presence of residual stresses induced by laser, decreasing the corrosion resistance of thestainless steel. Aluminum and silicon oxide inclusions were conveyed into the surface exposed to thecorrosive electrolyte by melting the metallic matrix surrounding them during the incidence of the laserbeam. The corrosive attack of this stainless steel matrix surrounding the oxide inclusions creates microcrevices, promoting pitting corrosion. This is the mechanism proposed to explain the increasedsusceptibility to localized corrosion associated to the areas affected by the laser marking process.
机译：这项工作的目的是评估激光打标技术对ASTM F139不锈钢表面微观组织和化学成分的影响，以及表面改性对其耐蚀性的影响。这是假体制造中最常用的生物材料之一。激光对耐腐蚀性的影响已通过电化学技术，特别是电化学阻抗谱进行了评估。已经发现，与未标记的材料相比，激光标记通过改变影响表面钝化层的微观结构和表面化学组成而降低了耐腐蚀性。通过与高分辨率场发射枪（SEM-FEG）耦合的扫描电子显微镜和透射电子显微镜（TEM）进行显微分析，分析了表面和化学成分。受激光雕刻影响的区域的TEM显示出非常高的位错密度，这表明存在由激光引起的残余应力，从而降低了不锈钢的耐蚀性。铝和氧化硅夹杂物在激光束入射期间通过熔化包围它们的金属基体而被传送到暴露于腐蚀性电解质的表面。包围氧化物夹杂物的这种不锈钢基体的腐蚀作用会产生微缝隙，从而促进点蚀。提出该机制是为了解释对与受激光标记过程影响的区域相关的局部腐蚀的敏感性增加。

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