Preprint Article Version 1 This version is not peer-reviewed

The Experimental and Theoretical Studies on Corrosion Phenomena of a Welded Stainless-Steel Pipe Under Salt Vapor Conditions

Version 1 : Received: 11 December 2018 / Approved: 12 December 2018 / Online: 12 December 2018 (12:17:36 CET)

How to cite: Yingsamphancharoen, T.; Siripaiboon, C.; Rodchanarowan, A. The Experimental and Theoretical Studies on Corrosion Phenomena of a Welded Stainless-Steel Pipe Under Salt Vapor Conditions. Preprints 2018, 2018120144 (doi: 10.20944/preprints201812.0144.v1). Yingsamphancharoen, T.; Siripaiboon, C.; Rodchanarowan, A. The Experimental and Theoretical Studies on Corrosion Phenomena of a Welded Stainless-Steel Pipe Under Salt Vapor Conditions. Preprints 2018, 2018120144 (doi: 10.20944/preprints201812.0144.v1).

Abstract

This work studied the corrosion of welded pipes and how welding destroyed surface film of pipes. Surface reaction of a welded pipe is key to understanding phenomena and important factors during the corrosion. This paper presents experiment and CFD modeling approaches of a welded pipe corrosion under salt vapor condition. The pipes were welded at currents of 60 A,70 A and 80 A to observe the effect of welding current on corrosion. A welded pipe is a stainless-steel ASTM A312 grade 304L and period of experiment about 0-600 hours that they are tested in vertical and horizontal alignments. In CFD software, there is not direct model of corrosion but it can use surface reaction and create add-on species and chemical reaction technique for imitating the corrosion mechanism. The modeling approaches of corrosion have presented in 3-dimensional transient times in CFD simulation. Surface reactions were performed by Species Model which involve site species. Site species in Species Model took place at gas-solid interfaces and in this case are salt vapor and surface pipe. Chemical reaction rate on the surface controls lost weight of a welded pipe and the model can be validated with experiment. In conclusion, in period 0-600 hours error between CFD modeling and experiment have error trend decreased. The error at 600 hours is 6% both of vertical pipe and horizontal pipe test. The modeling approaches closely with the performed experiment and can be accepted. Moreover, the model is able to predict corrosion of a welded pipe of different sizes and their lost weight after 600 hours without experiment. Also the model can predict lifetime of pipe.

Subject Areas

Stainless Steel ASTM A312 Grade 304L, Under Salt Vapor; Corrosion Rate, Welding Procedure Specification, CFD Modeling

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