桥梁缆索高强钢丝均匀腐蚀及点蚀的规律

Experiment Research on Uniform Corrosion and Pitting Corrosion of High-Strength BridgeWires

摘要:

为了研究桥梁缆索高强钢丝均匀腐蚀及点蚀的规律，采用酸性盐雾试验制作了6种共30根不同腐蚀程度的钢丝试件，通过质量分析、三维扫描等手段，研究了腐蚀高强钢丝均匀腐蚀深度、点蚀深度的演变规律.试验结果表明：均匀腐蚀深度随腐蚀时长的变化遵循幂函数规律，均匀腐蚀深度的变异系数随腐蚀时长减小；钢丝的点蚀深度服从正态分布，最大点蚀深度服从极值I型分布.最后，建立了均匀腐蚀深度与最大点蚀深度的预测模型，并运用于具体实桥分析预测中.

关键词:桥梁缆索高强钢丝;均匀腐蚀;点蚀;最大点蚀深度

Abstract:

In order to study the uniform corrosion and pitting corrosion of highstrength bridge wires, a total of 30 steel wire specimens on six corrosion levels were prepared by using the acetic acid salt spray test. The variation of uniform corrosion depth and pitting depth was evaluated by using weight analysis and three dimension scanning. The results show that the measured uniform corrosion depth follows the powerlaw distribution. The coefficient of variation of uniform corrosion depth decrease with the corrosion time. The pitting depth follows the normal distribution and maximum pitting depth follows the extreme value distribution. Finally, the prediction models for uniform corrosion depth and maximum pitting depth were established and then applied to the real cables on the bridge.

Key words:highstrength bridge wires; uniform corrosion; pitting corrosion; maximum pitting depth