A study on weathering steel bolts for transmission towers

Zeng, Shangwu; Xu, Delu; Li, Daijun; Li, Guang; Chang, Jiang; Fu, Chao

doi:10.1016/j.jcsr.2020.106295

Cited by 10 publications

(2 citation statements)

References 24 publications

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“…In the galvanization process, the descaled steel is immersed in a liquid zinc solution of about 450 °C to creat a zinc layer that provides corrosion protection for the steels on the surface of the steel [13][14][15][16]. Galvanization has been extensively applied to the surface of steel for the corrosion protection of power transmission towers [17][18][19]. Zinc has excellent ductility and corrosion resistance, and it is available to block corrosion-prone steels from oxygen, moisture and gaseous pollutants through galvanization [20,21].…”

Section: Introductionmentioning

confidence: 99%

Degradation behavior of mechanical properties of galvanized steel exposed to the wind and sand environment

Wang

Liu

et al. 2022

Materialwissenschaft Werkst

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In this work, the degradation of mechanical properties of galvanized steel under wind and sand erosion environment was studied. The law of weight loss of galvanized steel in corrosive environment was studied by accelerated corrosion experiment. The micro-morphology and formation mechanism of corrosion products were investigated in detail by scanning electron microscopy and x-ray diffraction, respectively. In addition, the mechanical properties of galvanized steel such as elastic modulus, yield strength, ultimate strength and elongation were investigated in detail. The results show that the weight loss rate of the zinc layer on the surface of galvanized steel follows an exponential function. Without the protection of the zinc layer, the mechanical properties of the steel will decrease quickly. Therefore, a zinc layer on the steel is necessary. Besides, it is necessary to strengthen the hot-dip galvanizing treatment on galvanized steel. This work provides a valuable reference for the corrosion behavior and protection measures of galvanized steel in the wind and sand environment.

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Section: Introductionmentioning

confidence: 99%

Degradation behavior of mechanical properties of galvanized steel exposed to the wind and sand environment

Wang

Liu

et al. 2022

Materialwissenschaft Werkst

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“…Power line lattice towers are manufactured in various shapes, always in the form of four-sided lattice structures, and braced in the individual faces by bracing members made of simple angles. The leg members [14] of the angles are lapped along the height by bolted lap joints, and the bracing angles are connected to the leg members by a single bolt [15].…”

mentioning

confidence: 99%

Corrosion Damage to Joints of Lattice Towers Designed from Weathering Steels

Křivý

2022

Materials

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The article dealt with the load-bearing capacity and durability of power line lattice towers designed from weathering steel. Attention was paid in particular to the bolted lap joints. The article evaluates the static and corrosion performance of bolted lap joints in long-term operating towers, and also presents and evaluates design measures that can be applied in the design of new lattice towers, or in the reconstruction of already operating structures. Power line lattice towers are the most extensive realization of weathering steel in the Czech Republic. On the basis of the inspections carried out to evaluate the working life of the transmission towers in operation, it can be stated that a sufficiently protective layer of corrosion products generally developed on the bearing elements of the transmission towers. However, the development of crevice corrosion at the bolted joints of the leg members is a significant problem. In this paper, the corrosion damage of bolted joints was evaluated considering two basic aspects: (1) the influence of crevice corrosion on the bearing capacity of the bolted joint was evaluated, using experimental testing and based on analytical and numerical calculations; (2) appropriate design measures applicable to the rehabilitation of developed crevice corrosion of in-service structures, or the elimination of crevice corrosion in newly designed lattice towers, was evaluated. Calculation analyses and destructive tests of bolted joints show that the development of corrosion products in the crevice does not have a significant effect on the bearing capacity of the joint, provided that there is no significant corrosion weakening of the structural elements, and bolts of class 8.8 or 10.9 are used. The results of the long-term experimental programme, and the experience from the rehabilitations carried out, show that, thanks to appropriate structural measures, specified in detail in the paper, the long-term reliable behaviour of the lattice towers structures is ensured.

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Study of effects of rare earth elements on the corrosion behavior of weathering steels under a simulated immersion environment and a real atmospheric environment

Fan,

Xi,

Liu

et al. 2024

Materials & Corrosion

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The effects of rare earth elements (REEs) on the corrosion behavior of weathering steels under a simulated immersion environment and a real atmospheric environment have been investigated in this paper. Although the corrosion rate of the indoor accelerated corrosion experiment (0.01 mol/L NaHSO3) is much higher than that of the real atmospheric exposure experiment, the addition of REEs can highly improve the corrosion resistance of test steels under both conditions. The improvement of the corrosion resistance can be attributed to the quick transformation of γ‐FeOOH into α‐FeOOH and the accelerated formation of a stable rust layer by REEs. Furthermore, the segregation of the REE inner rust layer increases the density of the rust layer and prevents corrosive particles from eroding the matrix. REEs can also promote the segregation of Cu, Cr, and other alloying elements in the rust layer, thus blocking the cracks and holes and enabling the formation of a continuous rust layer with good adhesion.

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A study on weathering steel bolts for transmission towers

Cited by 10 publications

References 24 publications

Degradation behavior of mechanical properties of galvanized steel exposed to the wind and sand environment

Degradation behavior of mechanical properties of galvanized steel exposed to the wind and sand environment

Corrosion Damage to Joints of Lattice Towers Designed from Weathering Steels

Study of effects of rare earth elements on the corrosion behavior of weathering steels under a simulated immersion environment and a real atmospheric environment

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