Electrochemical investigation on the corrosion of 18%Ni M250 grade maraging steel under welded condition in sulfuric acid medium

Abstract

The corrosion behavior of welded maraging steel in sulfuric acid solutions has been studied over a range of acid concentrations and solution temperatures by electrochemical techniques such as Tafel extrap olation and electrochemical impedance spectroscopy. The studies have revealed that the corrosion rate of welded maraging steel increases with the increase in temperature and increase in concentration of sulfuric acid in the medium. The thermodynamic parameters such as activation energy, enthalpy of activation and entropy of activation for the corrosion process are calculated. The results obtained through the two tech niques are in good agreement. The surface morphology and surface composition of the corroded samples have been examined by scanning electron microscopy (SEM) and energy dispersive X ray (EDX) analysis, respectively.

4-Hydroxyl-N′-[(3-Hydroxy-4-Methoxyphenyl) Methylidene] Benzohydrazide] as Corrosion Inhibitor for Carbon Steel in Dilute H2SO4

“…It can be seen from Table 2 that % IE decreases with increase in temperature in 0.5 M H 2 SO 4. This may be due to decrease in the protective nature of the inhibitive film formed on the metal surface and desorption of the HMBH molecules at higher temperature [22]. The variation of % IE with varying concentrations of HMBH at different temperatures is depicted in Fig.…”

Corrosion inhibition of high strength maraging steel by cerium(III) ions in sulfuric acid solution

“…The corrosion and corrosion protection of maraging steels in different media have been investigated by many researchers . It has been reported that maraging steels show better corrosion resistance in acidic solutions compared to tempered martensite alloy steels.…”

“…The corrosion of maraging steels in acidic solutions results mainly during the acid cleaning, where the scales and corrosion products that form on the steel surface and cause a negative effect on the performance of the steel equipment must be cleaned using an acidic pickling solution. In this regard, sulfuric acid is one of the most aggressive acids for iron and its alloys and is often used during cleaning, pickling, descaling, acidizing, and so forth .…”

Effects of Immersion Time and 5‐Phenyl‐1H‐tetrazole on the Corrosion and Corrosion Mitigation of Cobalt Free Maraging Steel in 0.5 M Sulfuric Acid Pickling Solutions

“…The corrosion of maraging steels in acidic solutions results mainly during the acid cleaning, where the scales and corrosion products that form on the steel surface and cause a negative effect on the performance of the steel equipment must be cleaned using an acidic pickling solution. In this regard, sulfuric acid is one of the most aggressive acids for iron and its alloys and is often used during cleaning, pickling, descaling, acidizing, and so forth [2,10].…”