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金属学报  2013, Vol. 49 Issue (5): 614-620    DOI: 10.3724/SP.J.1037.2012.00716
  论文 本期目录 | 过刊浏览 |
不锈钢表层对空化与电化学腐蚀交互作用的纳米力学响应
张茹,沈汉杰,张雅琴,李栋梁,李彦嘉,雍兴跃
北京化工大学有机无机复合材料国家重点实验室, 北京 100029
SURFACE LAYER NANO-MECHANICAL RESPONSES TO INTERACTION BETWEEN CAVITATION AND ELECTROCHEMICAL CORROSION
ZHANG Ru, SHEN Hanjie, ZHANG Yaqin, LI Dongliang, LI Yanjia, YONG Xingyue
State Key laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029
全文: PDF(1089 KB)  
摘要: 

采用纳米压入测试技术, 研究了阳极极化对空化作用下奥氏体不锈钢表层力学性能(纳米硬度Hnano和纳米弹性模量Enano)的影响, 并结合失重法与腐蚀形貌分析, 探讨了阳极极化对空泡腐蚀过程中协同效应机制的作用. 同时, 将表层平均纳米硬度与平均纳米弹性模量的比值定义为表层综合力学性能参数(H/E)nano. 结果表明, 在不同的阳极极化条件下, 空泡腐蚀试样表层纳米硬度、弹性模量和表层综合纳米力学参数的演化规律存在很大差异. 随着阳极极化电流增大, 表层纳米硬度和表层综合纳米力学参数逐渐减小, 表层纳米弹性模量逐渐增大. 在空化作用下, 当阳极极化处于钝化区时, 其协同效应主要为空泡磨损起作用; 当阳极极化处于钝化开始向过钝化状态转变时, 其协同效应机制为腐蚀引起的磨损过程控制; 一旦处于过钝化区, 其协同效应则主要为磨损引起的腐蚀过程控制. 奥氏体不锈钢表层纳米硬度是决定耐空泡腐蚀性能的关键因素. 在空化与电化学腐蚀的交互作用过程中, 随着电化学腐蚀增大, 腐蚀引起的磨损失重量增大, 即非Faraday失重增大, 腐蚀表面也因此呈现坑、点、沟槽状的形貌特征.

关键词 奥氏体不锈钢纳米压入技术表层纳米力学性质空化    
Abstract

Cavitation corrosion resistances of metals have a very much closed relationship with the mechanical properties of their surface layer. It is very important to investigate effects of surface layer mechanical properties on cavitation corrosion to understand synergistic mechanism. Nano-indentation technology is a sensitively power tool for measuring surface layer mechanical properties in nanometer scale. In this work, it was used to study the effects of anodic polarization on the surface layer nano-mechanical properties (nano-hardness, Hnano and nano-elastic modulus, Enano) of austenitic stainless steel under cavitation. The synergistic mechanism of cavitation corrosion caused by anodic polarization was also investigated by weight loss in conjunction with SEM. The surface layer comprehensive nano-mechanical parameter was defined as (H/E)nano. It was found that the profiles of Hnano, Enano and (H/E)nano with displacement into surface (L) are very different at different anodic polarized potentials. Hnano and (H/E)nano decrease and Enano increases with the increment of logarithm of anodic current density. When the samples under cavitation were polarized at passive region, cavitation corrosion of austenitic stainless steel is mainly controlled by erosion. However, it is mainly dominated by  corrosion-induced erosion and erosion--induced corrosion, respectively, if anodic polarized potentials were controlled at the beginning of passive to super-passive and super-passive regions. The surface layer nano-hardness is a key factor dominating cavitation corrosion resistances of metals. During the interaction of cavitation with electrochemical corrosion, mass loss of corrosion-induced erosion, which is called non-Faraday weight loss, increases as a result of electrochemical corrosion. The corresponding corroded morphologies with microgrooves, micro-holes and micro-pits were observed.

Key wordsaustenitic stainless steel    nano-indentation    surface layer nano-mechanical property    cavitation
收稿日期: 2012-12-04     
基金资助:

国家自然科学基金资助项目50871011

通讯作者: 雍兴跃     E-mail: yongxy@mail.buct.edu.cn
作者简介: 张茹, 男, 1986年生, 硕士生

引用本文:

张茹,沈汉杰,张雅琴,李栋梁,李彦嘉,雍兴跃. 不锈钢表层对空化与电化学腐蚀交互作用的纳米力学响应[J]. 金属学报, 2013, 49(5): 614-620.
ZHANG Ru, SHEN Hanjie, ZHANG Yaqin, LI Dongliang, LI Yanjia, YONG Xingyue. SURFACE LAYER NANO-MECHANICAL RESPONSES TO INTERACTION BETWEEN CAVITATION AND ELECTROCHEMICAL CORROSION. Acta Metall Sin, 2013, 49(5): 614-620.

链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00716      或      https://www.ams.org.cn/CN/Y2013/V49/I5/614

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