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Research on Application Performance of Surface Anti-corrosion
Technology of Corrugated Steel Beam Guardrails
Lei Peng
1,a
, Donghua Guo
1,b
, Hengquan Liu
1,c
1Research Institute of Highway, Ministry of Transport, Beijing 100088, China
al.peng@rioh.cn, bdh.guo@rioh.cn, chengquan.liu@rioh.cn
Keywords: Corrugated steel beam guardrails, Surface engineering, Anti-corrosion, Hot-dip
galvanized, Hot dip aluminized
Abstract. The hot-dip galvanized and hot dip aluminized are widely used surface anti-corrosion
technologies in steel beam guardrails region all over the world. Both of coating can not only play
the role of landscaping, but also can protect the base metal from being eroded, and greatly
extending the life of the guardrails. The appearance quality, process characteristics, corrosion
resistance and cost of the two anti-corrosion coating are described in this paper. By analyzing both
the similarities and differences between the two anti-corrosion technologies and their application
advantages, we hope to provide some references on choosing the surface anti-corrosion technology.
Introduction
The corrugated steel beam guardrails which belonging to the road infrastructure is longitudinal
energy absorbing structure, through deforming or vehicle climbing higher to absorb the impact
energy, it can change the direction of the vehicles to prevent vehicles from crossing the way out or
into the opposite lane, reduce occupant injury[1]. It plays an important role on mitigating the
severity of the accident, excluding the vertical and horizontal interference, improving the level of
road service and enhancing the road landscape.
The surface corrosion treatment is necessary for corrugated steel beam guardrails to prolong its
longevity, because it will withstand the corrosive attack of the environment when in use. Hot-dip
galvanized and hot dip aluminized technologies are widely used surface anti-corrosion in the field
of traffic safety facilities. The appearance quality, process characteristics, corrosion resistance and
cost of the two anti-corrosion coating are described in this paper.
Appearance Quality
The color of hot-dip galvanized layer is light gray in the beginning, it will turn to dark gray slowly.
Compared to the hot-dip galvanized layer, hot dip aluminized layer is silver white and slightly
rough, but the color basically unchanged in useful life.
The hot-dip galvanized layer which has good adhesion properties composed with zinc layer and
iron-zinc alloy layer, and has long history of application and large dosage relatively.
Process Analysis
Hot-dip Galvanized Process. After surface cleaning and activating, the guardrail components
immerged in liquid zinc, through the reaction diffusion between iron and zinc to generate the
iron-zinc alloy layer on the steel surface, this is the hot-dip galvanized process. According to the
different methods of process operation, hot-dip galvanized can be divided into two categories both
connections and differences: continuous hot-dip galvanized and batch hot-dip galvanized [2].
Continuous Hot-dip Galvanized Process. The structural components are immersed in a zinc
bath quickly through the hot-dip galvanizing unit on the continuous production line.
Batch Hot-dip Galvanized Process. The structural components are immersed in a zinc bath
single piece or bulk after pre-treatment. Batch hot-dip galvanized is divided into dry hot-dip
galvanized and wet hot-dip galvanized [2]
by different plating methods. Because the dry hot-dip
Advanced Materials Research Online: 2013-09-04
ISSN: 1662-8985, Vol. 787, pp 10-13
doi:10.4028/www.scientific.net/AMR.787.10
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