不同镀层在中东海湾地区光伏电站钢桩基防腐中的试验研究

EXPERIMENTAL STUDY ON ANTI-CORROSION OF STEEL PILE FOUNDATION USING DIFFERENT COATINGS FOR PV POWER STATIONS MIDDLE EAST GULF REGION

中东海湾地区常年高温多湿,土壤为中、重度盐碱化,富含氯离子及硫酸根离子,土壤湿度大,导电率强,属重度土壤腐蚀地区。该地区光伏电站常采用H型或C型钢桩基并采用热浸镀锌和镀镁铝锌对钢桩表面进行镀层防腐工艺。通过扫描电子显微镜研究镀层的表面形态,通过能谱仪与X射线衍射仪研究镀层中合金元素分布特征,同时研究其维氏硬度、耐磨性、耐氯性、耐碱性,并进行模拟土壤环境的电化学腐蚀试验研究。研究验结果表明:镀镁铝锌中由于镁的引入,改善了镀层的晶体结构,有助于提升其防腐性能,更适合于光伏支架钢桩基的长期防腐。

The Middle East Gulf region has high temperatures and high humidity all year round,and the soil is medium to severe salinization,rich in chloride and sulfate ions.The soil has high humidity and strong conductivity,making it a region with severe soil corrosion.PV power stations in this area often use H or C steel piles foundation and use hot dip galvanizing and magnesium aluminum zinc plating on the surface of steel piles foundation for coating anticorrosion technology.This paper studies the surface morphology of the coating through scanning electron microscope,and investigates the distribution characteristics of alloying elements in the coating through energy spectrometer and X-ray diffraction.At the same time,the Vickers hardness,wear resistance,chlorine resistance and alkaline resistance of the coating are also studied,and the electro-chemical corrosion test is conducted to simulate the soil environment.The test results show that the introduction of magnesium in magnesium aluminum zinc plating improves the crystal structure of the coating,which helps to improve its anti-corrosion performance,and is more suitable for long-term anti-corrosion of PV bracket steel pile foundation.