Sustainable and environmentally friendly zinc coatings for protecting steel bridges in Europe

2021 ◽  
Author(s):  
M. C. van Leeuwen ◽  
P. M. Gangé ◽  
B. Duran ◽  
F. Prenger
Keyword(s):  
Corrosion Protection ◽  
Life Cycle Cost ◽  
Zinc Coating ◽  
Environmentally Friendly ◽  
Cost Effective ◽  
Steel Bridges ◽  
Metallic Zinc ◽  
Protection Measures ◽  
Paint Systems ◽  
Zinc Coatings

<p>Metallic zinc coatings are well established as cost-effective corrosion protection for steel bridges. The zinc coating acts first as barrier protection, isolating the base steel from corrosive elements, and secondly by cathodic protection, acting as a sacrificial anode to protect the steel should the coating be compromised. Bridge operators can be confronted by disproportional high maintenance costs for bridges in use as removal of (in)organic paint systems with hazardous and toxic compounds require expensive waste disposal and environmental protection measures. Metallic zinc coatings are recognized as environmentally friendly, sustainable, and low maintenance, providing the lowest life cycle cost corrosion protection. Various case studies with bridges protected with metallic zinc coatings in and outside Europe are illustrated.</p>

Painting of Arc Sprayed Zinc Coatings with Water-Based Paints

2000 ◽  
Author(s):  
R.T. Lahtinen ◽  
P.J.T. Jokinen
Keyword(s):  
Laboratory Tests ◽  
Atmospheric Corrosion ◽  
Zinc Coating ◽  
Field Tests ◽  
Steel Structures ◽  
Coating Process ◽  
Paint Systems ◽  
Large Steel ◽  
Water Based ◽  
Zinc Coatings

Abstract Hot dip galvanized zinc coatings on steel structures are known to have superior atmospheric corrosion resistance properties compared to painted structures. However, the zinc coating can not be applied by this method on large steel structures. The protection of large steel structures against atmospheric corrosion is traditionally done by painting. The environmental pressure to eliminate solvent based paints has forced the painting contractors to move towards water based paints or completely rethink the coating process. One solution to this problem is to use arc sprayed zinc as the "primer" and water based paints as a sealer and a top coat. The research and field tests conducted and supervised by VTT has produced promising results that are described in the paper. The possibility to apply water based paints directly over the arc sprayed zinc is discussed and results of field and laboratory tests are given. The economic aspects of both water based and traditional paint systems over the arc sprayed zinc are discussed in the paper.

Life-cycle cost-effective optimum design of steel bridges

2004 ◽  
Vol 60 (11) ◽  
pp. 1585-1613 ◽  
Author(s):  
Kwang-Min Lee ◽  
Hyo-Nam Cho ◽  
Young-Min Choi
Keyword(s):  
Life Cycle ◽  
Optimum Design ◽  
Life Cycle Cost ◽  
Cost Effective ◽  
Steel Bridges

Preliminary Study of DLC Coatings Aiming to the Corrosion Protection of Ferrous Materials

2010 ◽  
Vol 10 ◽  
pp. 113-120
Author(s):  
G. Vourlias ◽  
N. Pistofidis ◽  
D. Chaliampalias ◽  
Panos Patsalas ◽  
Efstathios K. Polychroniadis
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Protection ◽  
Zinc Coating ◽  
Chemical Vapor ◽  
Harsh Environments ◽  
Dlc Coatings ◽  
Preliminary Study ◽  
Diffraction Patterns ◽  
Zinc Coatings ◽  
Galvanized Coatings

Zinc hot-dip galvanizing is one of the most effective methods for the corrosion protection of ferrous substrates. However, the failure of zinc coatings is possible when exposed to harsh environments for rather long periods. The application of a thin diamond like carbon (DLC) film on the top of the zinc coating might be a promising method for promoting their corrosion resistance. In the present work, a DLC thin film was deposited on zinc galvanized coatings by Plasma Enhanced Chemical Vapor Deposition. The as-formed film was composed of nanostructured and amorphous areas. The electron diffraction patterns acquired from the nanograins correspond to carbon phases with d-spacing ranging from diamond to graphite. Additionally, after 18 days of exposure in a simulated marine atmosphere, the DLC coated samples were proven to be more resistant than the naked galvanized coatings indicating its potential to improve the corrosion resistance of galvanized ferrous materials.

Passivation of Zinc Coatings by Inhibition Chrome-Based Systems

2014 ◽  
Vol 1059 ◽  
pp. 67-73
Author(s):  
Jiří Votava ◽  
Martin Kotus ◽  
Vojtěch Kumbár
Keyword(s):  
Service Life ◽  
Salt Spray ◽  
Current Trend ◽  
Zinc Coating ◽  
Thick Layer ◽  
Self Healing ◽  
Paint Systems ◽  
Inorganic Coatings ◽  
The Individual ◽  
Zinc Coatings

The anticorrosion resistance of metal (inorganic) coatings is defined by the system of anode and cathode protection. As zinc coatings do not load the environment in such an extent like organic paint systems, current trend is to maximally prolong the service life of a zinc coating. This paper is focused on analysis of the speed of corrosion degradation of zinc coatings. The individual samples were prepared by the method of hot-dipping and galvanizing. Inhibition systems were applied only to electrolyte-applied zinc coating. There were prepared three different passivating methods: (1) slim-layer passivation with the content of Cr (III), (2) slim-layer passivation with the inhibitor Cr (VI) and (3) thick-layer passivation with Cr (III). The thickness of anticorrosion coatings has been measured by both destructive and non-destructive methods. The weight of the applied anticorrosion substrate was measured in compliance with the ČSN EN ISO 3892 standard. Ductile characteristics were analysed according to the ČSN EN ISO 1519 standard. The total evaluation of anticorrosion resistance was processed according to the ČSN EN ISO 9227 standard (salt-spray test). Based on the results of corrosion tests, the individual coatings can be analysed and their corrosion resistance can be evaluated. The service life of the zinc coating can be prolonged by sealing off the zinc coating by an appropriate inhibitor which supports the self-healing effect of the whole anticorrosion substrate.

Prolonging the lifetime of existing reinforced concrete infrastructures with thermal sprayed zinc coating anodes

2021 ◽  
Author(s):  
P. M. Gangé ◽  
B. Duran ◽  
M. C. van Leeuwen ◽  
F. Prenger
Keyword(s):  
Reinforced Concrete ◽  
Zinc Coating ◽  
Concrete Structures ◽  
The United States ◽  
Steel Reinforcement ◽  
Concrete Bridges ◽  
Reinforced Concrete Structures ◽  
Metallic Zinc ◽  
Barrier Coating ◽  
Zinc Coatings

<p>Metallic zinc coatings protect steel from corrosion by acting first as a barrier coating and more importantly as a sacrificial anode. Zinc will provide galvanic protection to the steel. As such, concrete structures reinforced with plain or black steel showing signs of distress can be galvanically protected with external zinc anodes. Thermal sprayed metallic zinc coatings on the exposed surface of the concrete can be electrically connected to the steel reinforcement and provide corrosion protection to the steel.</p><p>Thermal sprayed zinc coatings were successfully tested as anodes in cathodic protection systems for reinforced concrete structures in the United States. Subsequent installations were made on numerous structures, including three historic reinforced concrete bridges in the state of Oregon. The 20-plus-year performance confirms that the service life of reinforced concrete structures can be significantly and economically extended by using metallic zinc anodes to protect the plain steel reinforcement from further corrosion.</p><p><br clear="none"/></p>

scholarly journals Mechanically Robust and Repairable Superhydrophobic Zinc Coating via a Fast and Facile Method for Corrosion Resisting

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1779 ◽  
Author(s):  
Junfei Ou ◽  
Wenhui Zhu ◽  
Chan Xie ◽  
Mingshan Xue
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Protection ◽  
Zinc Coating ◽  
Metal Corrosion ◽  
Practical Application ◽  
Sliding Angle ◽  
Variation Curve ◽  
Fabrication Procedure ◽  
Mechanical Durability ◽  
Zinc Coatings

Zinc coatings and superhydrophobic surfaces have their own characteristics in terms of metal corrosion resistance. Herein, we have prepared a robust and repairable superhydrophobic zinc coating (SZC) based on a widely commercially available cold galvanized paint via a fast (within 10 min) and facile process for corrosion resistance. Specifically, the cold galvanized paint was sprayed onto the iron substrate, followed by acetic acid (HAc) etching and stearic acid (STA) hydrophobizing. The as-obtained sample was coded as Fe-Zn-HAc-STA and possessed an apparent contact angle of 168.4 ± 1.5° as well as a sliding angle of 3.5 ± 1.2°. The Fe-Zn-HAc-STA sample was mechanically durable and easily repairable. After being ultrasonicated in ethanol for 100 min, the superhydrophobicity was still retained. The Fe-Zn-HAc-STA sample lost its superhydrophobicity after being abraded against sandpaper with a load of 100 g and regained its superhydrophobicity after HAc etching and subsequent STA hydrophobizing. The corrosion resistance of the SZC was investigated by immersing the Fe-Zn-HAc-STA sample into the static or dynamic aqueous solution of NaCl (3.5 wt.%) and the lasting life of the entrapped underwater air layer (EUAL) was roughly determined by the turning point at the variation curve of surface wettability against immersion time. The lasting life of the EUAL iwas 8 to 10 days for the SZC in the static NaCl solution and it decreased sharply to 12 h in a dynamic one with the flow rate of 2 and 4 m/s. This suggests that the superhydrophobic surface provided extra corrosion protection of 8 to 10 days or 12 h to the zinc coating. We hope that the SZC may find its practical application due to the facile and fast fabrication procedure, the good mechanical durability, the easy repairability, and the good corrosion protection.

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