In this study, two electrochemical techniques were used to characterize corrosion behavior of 17-4 PH stainless steel (UNS S17400), Inconel 625 (UNS N06625) and Ti-6Al-4V (UNS R56400) produced by power bed fusion process at different spatial scale.
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This paper suggests a new mechanism for explaining physics behind the localized corrosion attack based on experimental evidences. The effect of sand size and deposit type on localized corrosion attack in the presence of imidazoline type inhibitor is also experimentally investigated.
Corrosion behavior of 3Cr steel in CO2-O2 aqueous environment containing silty sand w/different sizes was investigated by immersion tests & electrochemical measurements. Results showed corrosion rate & morphology of 3Cr steel were affected by the size of silty sand.
Based on two hypotheses of the cause of this type of localized corrosion: an electrochemical galvanic effect and a chemical effect. Observations indicate that the electrochemical galvanic hypothesis was the key mechanism in this type of localized corrosion.
An overview of some of recent progresses in monitoring corrosion using probes/sensors as a practical means of acquiring in-situ and site-specific data from ‘invisible’ underground structures such as oil & gas pipelines
Alloys UNS N06600, N06690 and N08800 are used for steam generator tubes. Pitting corrosion was studied in 0.1 to 1 M chloride solutions with additions of thiosulfate ranging from 10-4 M to 10-2 M, at room temperature. The alloys were tested in solution annealed and thermally aged conditions.
An adhesive composition containing vapor corrosion inhibitors and its method of manufacturing are discussed. Inclusion in the adhesive mixture of a titanium and/or zirconium containing coupling agent resulted in better uniformity, viscosity and improved corrosion inhibiting properties.
Mild steel specimens (API 5L X65) were pretreated to form a pyrrhotite layer on the surface using high temperature sulfidation in oil, then exposed to a range of aqueous CO2 and H2S corrosion environments, leading to initiation of localized corrosion.
In this paper, the scaling mode at the early stage of carbon steel exposed to H2S environments with short exposure time were investigated. Corrosion exposure tests and linear polarization resistance (LPR) techniques were performed.
Two super duplex stainless steels were investigated: a W-free (UNS S32750) and a 2.1 wt% W-containing (UNS S39274) grade. Goals: To study localized corrosion resistance of super duplex stainless steels and how W affects the same.
High-entropy alloys (HEAs), are multicomponent alloys of at least 5 elements with 5-35 atomic % each. Immersion and electrochemical testing indicate that some high-entropy alloys have better corrosion performance than commercial alloys UNS N10276, UNS K03014, and UNS 31600.
An adapted electrochemical noise (EN) technique was developed. This research presents the ability to embed “early warning” information within corrosion management strategies. The materials studied included a niobium stabilized stainless steel.