西安建筑科技大学学报(自然科学版)

为研究高强钢丝镀锌层及Galfan镀层的耐蚀性,并建立腐蚀全过程点蚀概率模型,开展了中性盐雾加速腐蚀试验.对比分析了两种镀层的均匀腐蚀过程,研究了两种镀层的宏观与微观腐蚀形貌,通过动电位极化曲线测试阐释了两种镀层的耐蚀性,最后,采用三维表面形貌仪扫测腐蚀后镀层表面形貌,建立了腐蚀全过程点蚀概率模型.研究发现:镀锌层与Galfan镀层均匀腐蚀深度随腐蚀时间延长分别呈现线性增长与抛物线增长趋势,镀锌层与Galfan镀层腐蚀全过程宏观腐蚀形貌分别呈现两阶段与三阶段变化特征,黄褐色腐蚀物、红褐色锈斑覆盖钢丝表面约1/3的区域时,可分别判定两种镀层被完全腐蚀; 随着腐蚀时间延长,镀锌层微观腐蚀形貌从初期的致密状态向多空、镂空状演变,Galfan镀层微观腐蚀形貌在前期由致密状态过渡至多空镂空状,进一步演变为层状堆叠状态,Galfan镀层被完全腐蚀时,微观形貌呈松散颗粒状; Galfan镀层的动电位极化曲线存在明显钝化区,且腐蚀时长越短,钝化区越稳定,镀锌层在腐蚀过程中的腐蚀倾向性轻微下降,Galfan镀层的腐蚀倾向性随暴露时间的延长下降较明显; 镀层点蚀概率模型中的区间最大点蚀系数不拒绝Gumbel分布,两种镀层区间最大点蚀系数分布的位置参数及尺度参数均随腐蚀时长的增加呈指数下降趋势.

To investigate the corrosion resistance of Galvanized coating and Galfan coating of high strength steel wires, and establish the pitting corrosion probability model of the whole corrosion process, the accelerated corrosion tests were conducted. The uniform corrosion process of the two coatings was compared, the macroscopic and microscopic corrosion features of the two coatings was studied, and the corrosion resistance of the two coatings was explained by the potentiodynamic polarization curve test. Finally, the surface morphology of the coatings after corrosion was measured by a three-dimensional surface morphometer, and the pitting corrosion probabilistic model of the whole corrosion process was established. It is found that the uniform corrosion depth of Galvanized coating and Galfan coating increases linearly and parabolically with the extension of corrosion time, and the macroscopic corrosion features of Galvanized coating and Galfan coating present two-stage and three-stage variation characteristics, respectively.The Galvanized coating or Galfan coating can be deemed to be corroded entirely when the yellow-brown corrosion substance and red-brown rust spot cover about 1/3 area of the wire surface. With the extension of exposure period, the microscopic corrosion feature of Galvanized coating evolves from the initial dense state to the hollow shape. In the preliminary stage, the microscopic corrosion feature of Galfan coating varies from dense state to hollow shape, and then tends to be stacked. When the Galfan coating is corroded entirely, the microscopic corrosion feature tends to be loss granular. Obvious passivation area can be seen on the potentiodynamic polarization curves of Galfan coating, and the shorter the corrosion time, the more stable the passivation zone. The corrosion tendency of Galvanized coating decreases slightly in the corrosion process, while the corrosion tendency of Galfan coating decreases obviously. According to the developed pitting corrosion probabilistic models, the block maximum pitting factor can be described by Gumbel distribution. For Galvanized coating and Galfan coating, both the location parameter and the scale parameter decrease exponentially with the extension of exposure period.

引言
1 试件制备与试验方法
2 均匀腐蚀过程分析
3 宏观与微观腐蚀形貌
4 动电位极化曲线分析
5 点蚀概率模型
6 结论

图1 加速腐蚀试件加工<br/>Fig.1 Manufacturing of accelerated corrosion specimens

图1 加速腐蚀试件加工
Fig.1 Manufacturing of accelerated corrosion specimens

表1 高强钢丝中微量元素质量百分比<br/>Tab.1 Mass percentages of microelements of the high strength steel wires

表1 高强钢丝中微量元素质量百分比
Tab.1 Mass percentages of microelements of the high strength steel wires

图2 试验装置与测试设备<br/>Fig.2 Experimental equipment and employed test instruments

图2 试验装置与测试设备
Fig.2 Experimental equipment and employed test instruments

表2 加速腐蚀时长<br/>Tab.2 Accelerated corrosion duration

表2 加速腐蚀时长
Tab.2 Accelerated corrosion duration

图3 两种镀层均匀腐蚀过程对比分析<br/>Fig.3 Comparison analysis of uniform corrosion process of two kinds of coatings

图3 两种镀层均匀腐蚀过程对比分析
Fig.3 Comparison analysis of uniform corrosion process of two kinds of coatings

表3 两种镀层全过程宏观腐蚀形貌<br/>Tab.3 Whole procedure macroscopic corrosion features of two kinds of coatings

表3 两种镀层全过程宏观腐蚀形貌
Tab.3 Whole procedure macroscopic corrosion features of two kinds of coatings

图4 镀层微观腐蚀形貌变化<br/>Fig.4 Evolution of microtopography of corroded coatings

图4 镀层微观腐蚀形貌变化
Fig.4 Evolution of microtopography of corroded coatings

图5 不同腐蚀时长极化曲线上右去掉<br/>Fig.5 Polarization curves for different corrosion durations

图5 不同腐蚀时长极化曲线上右去掉
Fig.5 Polarization curves for different corrosion durations

图6 基于实测二维轮廓线的3D点蚀深度获取<br/>Fig.6 3D Corrosion depth calculation based on measured 2D surface contour

图6 基于实测二维轮廓线的3D点蚀深度获取
Fig.6 3D Corrosion depth calculation based on measured 2D surface contour

图7 点蚀概率模型结果分析<br/>Fig.7 Result analysis of pitting corrosion probabilistic model

图7 点蚀概率模型结果分析
Fig.7 Result analysis of pitting corrosion probabilistic model

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备注

引言

1 试件制备与试验方法

2 均匀腐蚀过程分析

3 宏观与微观腐蚀形貌

4 动电位极化曲线分析

5 点蚀概率模型

6 结论

期刊信息