The improvement of weathering resistance by increasing P contents in cast strips of low carbon steels

Zhou, Guo-Ping; Liu, Z.Y.; Qiu, Yiqing; Wang, G.D.

doi:10.1016/j.matdes.2009.04.010

Cited by 16 publications

(7 citation statements)

References 16 publications

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“…P enrichment at the interface gives rise to the precipitation of phosphates, improving corrosion resistance and delaying the penetration of corrosive agents. A wet/dry cyclic laboratory test in 0.005 M NaHSO 3 solution showed a predicted lower corrosion rate than an equivalent WS with a 0.08% wt phosphorus content[147].7.1.2 Increasing the silicon contentMejía Gómez et al studied the behaviour of copper steel with increasing contents of Si, Si (1-3% wt) -Cu (0.3% wt) -Mn (0.5% wt), in accelerated wet/dry cyclic tests in 0.05M and 0.5M NaCl solutions, comparing the results with the behaviour of carbon steel[148]. Weight loss measurements indicated that corrosion resistance increased with the Si content of the steel, in particular in the case of relatively low chloride environments.…”

mentioning

confidence: 85%

Weathering steels: From empirical development to scientific design. A review

Morcillo¹,

Díaz²,

Chico³

et al. 2014

Corrosion Science

240

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The design of the first weathering steels was purely empirical and focused on a small number of conventional alloying elements such as manganese, silicon, chromium, nickel, copper and phosphorus, mainly. The environmental conditions that promote the formation of protective rust layers: existence of wet/dry cycling, absence of very long wetness times, atmospheres without a marine component, etc., were identified by trial and error. This paper makes a bibliographic review of the abundant literature that has been published on the atmospheric corrosion of weathering steels, setting out in chronological order the advances made in the scientific knowledge of important matters such as: atmospheric corrosion mechanisms of weathering steel, formation of protective rust layers, and the role played by alloying elements. The work ends with an overview of the scientific design of new weathering steels, placing special emphasis on the new compositions developed for application in marine atmospheres.

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mentioning

confidence: 85%

Weathering steels: From empirical development to scientific design. A review

Morcillo¹,

Díaz²,

Chico³

et al. 2014

Corrosion Science

240

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“…Phosphorus consists of a significant alloying element of low-alloyed and carbon steels against atmospheric corrosion [106] and Cl − attack [107], and it is considered to improve machinability, fatigue, and hardenability. Phosphating through immersion baths, as conventionally realized in industry, is considered to be complete after several days, mainly due to recrystallization and solid-state transformation processes and in order to enhance surface coherence with metallic coatings, as zinc phosphating [53] and even with organic protective coatings.…”

Section: Appl Sci 2019 9 X For Peer Reviewmentioning

confidence: 99%

Comparative Study on the Corrosion Inhibitive Effect of 2-Mecraptobenzothiazole and Na2HPO4 on Industrial Conveying API 5L X42 Pipeline Steel

et al. 2019

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Mild or low-carbon steel has an increasing utilization and is widely used for building construction, machinery parts, and pipelines, because it can be machined easily and has enhanced weldability as well as a low price. In any case, the corrosion resistance of mild steel under the conditions in industrial applications or in atmosphere is a thoughtful concern. This study inquires into the application of 2-mecraptobenzothiazole (MBT) and Na2HPO4 as corrosion inhibitors for the protection of API 5L X42 pipeline steel in 3.5 wt % NaCl as well as in water from the Athens city supply system. The electrochemical/morphological characterizations of the aforementioned mild steel proved that the corrosion protection mechanisms can be assigned to the protective layers created onto the metal surface because of the presence of the inhibitors, which prevent chloride’s penetration. The synergistic effect of the MBT and Na2HPO4 corrosion inhibition behavior, in a molar ratio of 1:1, revealed that the additives performed effectively with corrosion inhibition efficiency above 90%.

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“…The presence of relatively high phosphorus content (0.25 wt %) in the pillar plays a major role by facilitating the formation of a protective passive film on the surface [6,7]. As reported by G P Zhou et.al [8], the rust became more homogeneous and compact on increasing P content in cast strips. The P enrichment was observed at the interface between rust layer and substrate, which was believed to be responsible for the improvement of weathering resistance by retarding ingress of aggressive ions and moisture.…”

Section: Introductionmentioning

confidence: 66%

Mechanical properties of low alloy high phosphorus weathering steel

Jena¹,

Gupta²,

Singh³

et al. 2015

J min metall B Metall

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Mechanical behaviour of two low alloy steels (G11 and G12) was studied with respect to different phosphorus contents. Tensile strength and yield strength increased while percentage elongation at fracture decreased on increasing phosphorus content. The SEM and light optical photomicrograph of low phosphorus steel (G11) revealed ferrite and pearlite microstructures. On increasing phosphorus content from 0.25 wt.% to 0.42 wt.%, the morphology of grains changed from equiaxed to pancake shape and grain size also increased. The Charpy V notch (CVN) impact energy of G11 and G12 steel at room temperature was 32 J and 4 J respectively and their fractographs revealed brittle rupture with cleavage facets for both the steels. However, the fractograph of G11 steel after tensile test exhibited ductile mode of fracture with conical equiaxed dimples while that of G12 steel containing 0.42 wt. % P exhibited transgranular cleavage fracture. Based on this study, G11 steel containing 0.25 wt. % P could be explored as a candidate material for weathering application purpose where the 20 o C toughness requirement is 27 J as per CSN EN10025-2:2004 specification.

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The improvement of weathering resistance by increasing P contents in cast strips of low carbon steels

Cited by 16 publications

References 16 publications

Weathering steels: From empirical development to scientific design. A review

Weathering steels: From empirical development to scientific design. A review

Comparative Study on the Corrosion Inhibitive Effect of 2-Mecraptobenzothiazole and Na2HPO4 on Industrial Conveying API 5L X42 Pipeline Steel

Mechanical properties of low alloy high phosphorus weathering steel

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