Corrosion protection of steel cut‐edges by hot‐dip galvanized Al(Zn,Mg) coatings in 1 wt% NaCl: Part II. Numerical simulations
О. В. ДолгихHans SimillionSviatlana V. LamakaA.C. BastosH.B. XueMaryna TarybaAndré Renato OliveiraC. AllélyBart Van Den BosscheKrista Van Den BerghJoost De StryckerJohan Deconinck
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In this paper a mechanistic model is elaborated to simulate the corrosion behavior of aluminum–zinc–magnesium coatings on steel. The model is based on the mass transport and reactions of the ions in the electrolyte (MITReM). The finite element method has been used, which allows to perform time‐dependent simulations with micrometer scale to study local corrosion effects. The formation of corrosion products and the prediction of electrolyte concentration distributions are compared for different metallic coating compositions. The spatial and temporal simulation of complex precipitates provides an additional tool to validate the model through corrosion product characterization. The simulation results are compared to experimental observations, presented in part I of this paper. The MITReM simulations are limited to the micro‐scale and therefore to small geometries. A link is made with the potential model which can be applied on macro‐scale objects. A qualitative agreement is found between the simulations at both scales and the experiments. Further quantification of this model would optimize the simulations for material design and for predictive maintenance.Cite
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Describes the causes of zinc cosumption in steel strip galvanizing. The control of zinc cosumption in steel strip galvanizing is considered mostly by the control of coating layer and galvanized scraps,and it also propounds some methods of controlling zinc cosumption which have some guiding singnificance to control the cost in steel strip galvanizing.
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The main technical characteristics and development trends of flaky zinc-based zinc-rich coating were introduced, including flaky zinc-based powder coating, zinc-based waterborne inorganic zinc-rich coating, flaky zinc-based alcohol-soluble inorganic zinc-rich coating and the zinc-rich coating based on spherical and flaky combination. It is considered that the flaky zinc-based power coating, flaky zinc-based waterborne/alcohol-soluble inorganic zinc-rich coating and the zinc-rich coating based on spherical and flaky combination are the development orientation in the future.
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Galvanized carbon steel is one of the most used engineering material in industries, but its quality can be affected by the process parameters. The most common used galvanizing process is Hot Dip Galvanizing amongst others. The methods used were quantitative and qualitative for determining the parameters influencing galvanizing. The analytical techniques were performed by spectrometers, visual inspections thru optical and scanning electron microscope which show how parameters at the pickling, cold rolling and galvanizing processes that affect the quality of the galvanized components produced. During galvanizing there are process parameters that need to be monitored, necessitating evaluation of the process parameters that affect the hot galvanizing process. The focus of this paper is on parameters that affect the hot dip galvanizing process from different stages (pre-treatment, galvanizing and post treatment), but especially focused at the galvanizing bath. The quality of the galvanized carbon steel products gets greatly affected by the interference of the process parameters, this can lead to various types of rejects, thus influencing the quality leading to lower production output during the galvanizing process. But good follow ups of the parameters can lead to less defects which eventually increases production efficiency, component effectiveness and profit margins thus increased production of the hot dip galvanizing steels. So there is need to ensure that parameters for galvanizing are in accordance to standards.
Pickling
Carbon steel
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The types and addition dose of zinc in the zinc-rich coating have a significant impact on the character of coating. Two types of the zinc powders and the amount of zinc were researched in this paper. It reveals that flaky zinc coating is better than the spherical zinc coating on corrosion performance, and the performance of the coating will be the best only when the solid content of zinc is reasonable. The results also show that optimal solid content of flaky zinc are 62.5%, 60% and 60.5% in the inorganic zinc-rich coating, epoxy zinc-rich coating and vinyl resin zinc-rich coating, respectively.
Metal coating
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