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Effect of pH value, chloride ion concentration and salt spraying time on salt fog corrosion resistance of friction stir welded AA7075-T651 alloy joints
The main objective of this investigation is to study the effect of pH value, chloride ion concentration and salt spraying time on corrosion rate of stir zone (SZ) and parent metal (PM) regions of friction stir welded (FSW) AA7075-T651 aluminium (Al) alloy joints. The computational and stastical approach of response surface methodology (RSM) was deployed to generate the response surfaces from the experimental design and results. The effect of corrosion parameters was analyzed using the response surfaces. The design expert software package was employed in this investigation for this purpose. The 10 mm thick AA7075-T651 plates were butt welded using FSW. The corrosion rate of SZ of joints and PM was evaluated using salt fog corrosion test and predicted with less than 5% error using the RSM developed empirical relationship. The effect of pH value, chloride ion concentration, and spraying time on the corrosion rate of AA7075-T651 joints was analyzed in sodium chloride (NaCl) solution. The corrosion rate was estimated by utilizing the method of weight loss. An optical microscopy was used to examine pit morphology of corroded AA7075-T651joint surface. The surface morphology at pH3 showed that the SZ corrosion rate is more severe than parent metal (PM). When the chloride ion concentration and spraying time were equal, acidic corrosion occurred faster than alkaline or neutral corrosion. With increasing Cl- concentrations, AA7075-T651 alloy and SZ of friction stir welds surfaces were degraded. Corrosion rate decreases with increasing spraying time. The amount of hydrogen evolution decreased with increasing spraying time.
Effect of pH value, chloride ion concentration and salt spraying time on salt fog corrosion resistance of friction stir welded AA7075-T651 alloy joints
The main objective of this investigation is to study the effect of pH value, chloride ion concentration and salt spraying time on corrosion rate of stir zone (SZ) and parent metal (PM) regions of friction stir welded (FSW) AA7075-T651 aluminium (Al) alloy joints. The computational and stastical approach of response surface methodology (RSM) was deployed to generate the response surfaces from the experimental design and results. The effect of corrosion parameters was analyzed using the response surfaces. The design expert software package was employed in this investigation for this purpose. The 10 mm thick AA7075-T651 plates were butt welded using FSW. The corrosion rate of SZ of joints and PM was evaluated using salt fog corrosion test and predicted with less than 5% error using the RSM developed empirical relationship. The effect of pH value, chloride ion concentration, and spraying time on the corrosion rate of AA7075-T651 joints was analyzed in sodium chloride (NaCl) solution. The corrosion rate was estimated by utilizing the method of weight loss. An optical microscopy was used to examine pit morphology of corroded AA7075-T651joint surface. The surface morphology at pH3 showed that the SZ corrosion rate is more severe than parent metal (PM). When the chloride ion concentration and spraying time were equal, acidic corrosion occurred faster than alkaline or neutral corrosion. With increasing Cl- concentrations, AA7075-T651 alloy and SZ of friction stir welds surfaces were degraded. Corrosion rate decreases with increasing spraying time. The amount of hydrogen evolution decreased with increasing spraying time.
Effect of pH value, chloride ion concentration and salt spraying time on salt fog corrosion resistance of friction stir welded AA7075-T651 alloy joints
Int J Interact Des Manuf
Prabhuraj, P. (author) / Rajakumar, S. (author) / Balasubramanian, V. (author) / Sonar, Tushar (author) / Ivanov, Mikhail (author) / Elil Raja, D. (author)
2025-01-01
13 pages
Article (Journal)
Electronic Resource
English
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