Mitigating Corrosion in Activated Carbon Purified Biogas: A Case Study of Copper and Aluminum Metals

The objective of this study is to investigate the potential reduction in corrosion of aluminum and copper metals when exposed to biogas purified by activated carbon derived from cashew branches. Both aluminum and copper metals were subjected to raw and purified biogas, and their corrosion rates were analyzed using the gravimetric method. The results revealed that the corrosion rate of both metals increased over time when exposed to unfiltered biogas. However, a notable reduction in corrosion rate was observed when the metals were exposed to biogas filtered with activated carbon. This suggests that activated carbon derived from cashew branches could effectively mitigate the corrosive effects of hydrogen sulfide in biogas. Additionally, the study found that aluminum exhibited greater resistance to corrosion compared to copper when exposed to filtered biogas. This research on green inhibitors introduces novel approaches, particularly in utilizing activated carbon from cashew branches for biogas purification, offering a promising strategy to mitigate its corrosive nature. Furthermore, the evaluation of this filtration method's efficacy in protecting aluminum and copper metals underscores its potential significance in corrosion prevention within biogas systems.