Empirical Software Proposal for The Simulation and Optimization of The Galvanizing Process by Thermal Diffusion
Journal Title: Biomedical Journal of Scientific & Technical Research (BJSTR) - Year 2018, Vol 7, Issue 1
Abstract
The galvanizing process by thermal diffusion or Sherardizing is a process used by the industry to increase the corrosion resistance of some metals, especially steel. However, achieving a good optimization of this process, that is, an optimal consumption of Zn dust without exceeding the necessary quantity needed to get a homogenous coating layer thick enough to provide an efficient anti-corrosive property is not always easy. This work explores the difficulties found in the industry to optimize that process, and we propose a software that allow simulating and considering different parameters to propose the quantity of Zn dust to be used depending on the working conditions, the parts to by coated and the container used. This software allows also considering, in the simulation, the addition of Zn halides for improving the coating process.Zinc coatings is a method to brings great advantages in the protections of ferrous substrates [1-2]. There are different methods to perform Zn coatings [3], but the Sherardizing process is a thermochemical process very promising from the environmental point of view [4-5]. Although, its production efficiency is lower than other methods. In this process, the parts are gushed with Zn dust, generally in a revolving drum heated at temperatures between 320°C and 420°C, keeping the temperature under the Zn melting point. As a result, Zn vapor is formed that diffuses in the steel surface forming a coating alloy of Fe-Zn of between 10 to 75μm, (Figure 1) depending on the working conditions (mainly the working temperature and the annealing time). Due to the working temperature for the Sherardizing, all expected intermetallic phases are formed during this process, as can be seen in the Fe-Zn diagram of Kubaschewski [6] see Figure 2. Therefore, the numerical simulation of those phases formation is not an easy work, and even the most actual software has to perform several kind of assumptions to be able of simulating the growing of the different phases [7]. However, it is not the aim of this work. In the present paper, we do an empirical study of several Sherardizing processes being performed in the industry to allow us proposing the best working conditions and optimize the quantity of Zn dust to use in each particular case. In addition, a simple software has been created to manage the relations found in this work and be easily applicable by any user.
Authors and Affiliations
Víctor García, Raúl Nimo
Keywords
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- EP ID EP588502
- DOI 10.26717/BJSTR.2018.07.001430
- Views 162
- Downloads 0
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