文章信息/Info

Title:

Evaluation of Atmospheric Corrosion Grade and Prediction of Corrosion�睮nduced Thickness Loss of Hot-Dip Galvanized Steel in Shandong Province

文章編號:

1674-3962(2025)10-0929-09

作者:

程運佳; 樊志彬; 杜寶帥; 姜波; 黃振寧; 高智悅; 王蝶; 安江峰

1.中國機械總院集團武漢材料保護研究所有限公司，湖北 武漢 430030 2.國網山東省電力公司電力科學研究院，山東 濟南 250003 3.湖北武漢大氣淡水環境材料腐蝕國家野外科學觀測研究站，湖北 武漢 430030

Author(s):

CHENG Yunjia; FAN Zhibin; DU Baoshuai; JIANG Bo; HUANG Zhenning; GAO Zhiyue; WANG Die; AN Jiangfeng

1. China Academy of Machinery Wuhan Research Institute of Materials Protection Co.,Ltd.,Wuhan 430030, China 2. State Grid Shandong Electric Power Research Institute, Jinan 250003,China 3. Wuhan Materials Corrosion National Observation and Research Station,Wuhan 430030, China

關鍵詞:

大氣腐蝕; 熱鍍鋅鋼; 輸電桿塔; 腐蝕等級; 腐蝕失厚

Keywords:

atmospheric corrosion; hot-dip galvanized steel; transmission tower; corrosion grade; corrosion-induced thickness loss

分類號:

TG172.3; TM75

DOI:

10.7502/j.issn.1674-3962.202312007

文獻標志碼:

A

摘要:

鍍鋅鋼廣泛應用于輸電桿塔中，鍍鋅鋼服役過程中受到不同環境因素影響，在不同地區腐蝕速率不同，一定年限后其腐蝕失厚將相差較大。采用暴露試驗獲取熱鍍鋅鋼在山東地區100個試驗站點第1年的腐蝕速率，隨后利用空間插值算法繪制整個山東地區的熱鍍鋅鋼腐蝕等級分布圖，通過SEM與EDS分析已服役10年、12年、15年鍍鋅鋼構件有裂紋表面和無裂紋表面的元素，基于環境因子分析與腐蝕動力學方程預測鍍鋅層若干年后的腐蝕失厚。結果顯示，山東地區鋅的腐蝕等級在絕大部分地區為C3級，在北部沿海地區為C4級，在極少數地方為C2級或C5級；綜合SEM、EDS與環境因子分析發現氯化物與鋅腐蝕有直接關系，SO2濃度與NO2濃度對鋅腐蝕是起綜合作用，基于氯化物沉積速率、SO2濃度與NO2濃度對山東地區進行大氣類型分類，構建鋅在不同大氣類型下的腐蝕動力學模型，預測熱鍍鋅層在山東地區服役20年和50年后的平均腐蝕失厚與最大腐蝕失厚損失，繪制出腐蝕失厚分布圖，可為山東地區鍍鋅層厚度設計提供參考。

Abstract:

Galvanized steel is widely used in transmission towers. During service,galvanized steel is affected by different environmental factors, and the corrosion rate varies in different regions. After a certain period of time, its corrosion-induced thickness loss will vary greatly. The corrosion rate of hot�瞕ip galvanized steel in the first year at 100 test sites in Shandong was obtained by exposure test. Then the distribution map of hot-dip galvanized steel corrosion grade in the whole Shandong region was drawn by spatial interpolation algorithm. The elements on the surfaces of galvanized steel components that have been in service for 10, 12, and 15 years were analyzed by SEM and EDS at both cracked and uncracked areas. The corrosion loss of galvanized layer after several years is predicted based on the analysis of environmental factors and corrosion kinetics equation. The results show that the corrosion grade of zinc in Shandong Province is C3 in most areas, C4 in the northern coastal areas, and C2 or C5 in very few places. Based on SEM, EDS and environmental factor analysis, it was found that chloride was directly related to zinc corrosion, and the concentration of SO2 and NO2 had a comprehensive effect on zinc corrosion. Based on chloride deposition rate, SO2 concentration and NO2 concentration, the atmospheric type classification in Shandong was conducted, and kinetic models of zinc corrosion under different atmospheric types were constructed. The average and maximum corrosion�瞚nduced thickness loss after 20 years and 50 years of service in Shandong are predicted, and the distribution map of corrosion�瞚nduced thickness loss is drawn, which can provide reference for the thickness design of galvanized layer in Shandong.