Comparative Study on the Corrosion Behaviours of High-Silicon Chromium Iron and Q235 Steel in a Soil Solution

Lv, Kechen

doi:10.20964/2020.06.16

Cited by 8 publications

(7 citation statements)

References 38 publications

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“…They concluded that it may be caused by near-surface silicon diffusion and the corrosion resistance is strictly connected with the appearance of SiO 2 on the casting surface. According to the research 20 during the immersion in the solution, Si may dissolve into the solution and form SiO 2 oxides on the surface of HSCI. The presence of SiO 2 passive layer may increase the corrosion resistance and reduces the corrosion rate of high silicon cast iron.…”

Section: Summary and Discussionmentioning

confidence: 99%

Corrosion Resistance of Selected Cast Iron Grades Under Deposit Mining Conditions

Stawarz

Dojka

2021

Inter Metalcast

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The paper analyzes two types of alloyed cast iron used for pump impellers operated in mine working conditions. The research on corrosion resistance of two cast iron grades resistant to abrasive wear was presented. Tests were performed for chromium cast iron (HCCI) grade EN-GJN HV600 (XCr18) (acc. to EN 12513) and high-silicon cast iron HSCI Grade 1 (acc. to ASTM A 518/ A 518M - 99). Deposit mining is characterized by variable working conditions. Both types of cast iron are resistant to abrasive wear and are suitable for loaded elements (e.g. pump impellers). The paper presents a metallographic analysis of selected cast iron grades based on light microscopy. The chemical composition of the tested cast irons was determined with the Leco GDS 500 spectrometer; C and S content was determined with the CS125 Leco Carbon–Sulfur Determinator. The Si content for HSCI Grade 1 was determined by gravimetric method. Corrosion tests were performed under laboratory conditions. In-service tests of cast impellers were performed under real conditions (working mines applications). Corrosion resistance tests were measured with VoltaLab® Potentiostat (PGP 201). Performed tests resulted in the determination of the usefulness of materials used for dewatering pump impellers in mine working conditions. The results of laboratory tests were verified under the operating conditions of cast impellers. In the conditions of transporting a liquid-solid mixture at the moment of appearance of impurities (e.g. chlorine impurities) in the liquid, the impellers from cast iron HCCI revealed a tendency to pitting corrosion, which explains the exploitation results collected in the mining. After laboratory tests for sample from HCCI, the low value of breakdown potential Eb and repassivation Ecp was concluded which says about the absence of pitting corrosion resistance.

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Section: Summary and Discussionmentioning

confidence: 99%

Corrosion Resistance of Selected Cast Iron Grades Under Deposit Mining Conditions

Stawarz

Dojka

2021

Inter Metalcast

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“…There are obvious original defects on the specimen surface. The holes are irregular in shape, ranging in area from 200 to 2000 m m 2 , and the edges of the holes are sharp (Lv et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

“…Recently, some scholars developed a new material by simultaneously adding elements Si and Cr into the cast iron, naming high-silicon chromium iron (HSCI). Due to its high electrical conductivity and resistance to electrolytic corrosion, HSCI has been used in ground grids in southern China (Lv et al, 2020). The soil corrosion of HSCI in a near-neutral pH solution has been studied (Lv et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Due to its high electrical conductivity and resistance to electrolytic corrosion, HSCI has been used in ground grids in southern China (Lv et al, 2020). The soil corrosion of HSCI in a near-neutral pH solution has been studied (Lv et al, 2020). Unfortunately, as far as we know, the study on the corrosion behavior of HSCI in acidic and alkaline soil solutions has not been reported.…”

Section: Introductionmentioning

confidence: 99%

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Study on the corrosion behaviors of high-silicon chromium iron in acidic and alkaline soil solutions

Yang

et al. 2021

ACMM

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Purpose High-silicon chromium iron (HSCI) has been used in ground grids in southern China, while there was a lack of study on its corrosion behavior in this soil environment. The purpose of this paper is to discover the corrosion of HSCI in acidic and alkaline soil solutions. Design/methodology/approach The original defects on the HSCI surface were observed using optical microscopy, and the corrosion behavior of the HSCI in the acidic and alkaline soil solutions were jointly detected using electrochemical measurements and scanning electron microscopy/energy dispersive spectrometer. Findings The results showed the corrosion rates of the HSCI in the acidic and alkaline soil solutions were limited, and the high contents of Cr and Si in matrix was responsible for its high corrosion resistance. The HSCI showed a similar corrosion tendency in the two solutions, while its corrosion rate in the acid soil solution was higher than that in the alkaline soil solution. The corrosion pits on the specimen surface were originated from the original defects in matrix, and the edges of the corrosion pits were more rounded than the original defects after 720 h immersion in the two solutions. The original defects in the HSCI matrix played a significant role in the corrosion process. Originality/value The paper discovered the corrosion evolution of HSCI in the acidic and alkaline soil solutions. What is more, the acceleration role of the original defects on the corrosion of the HSCI in the acidic and alkaline soil solutions was discovered in the paper. The results are beneficial for the material selection of ground grid equipment in engineering.

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“…Therefore, higher requirements on the operational performance of grounding grids were put forward. However, the soil corrosion problem is a key and intractable factor that threatens the safe operation of a grounding grid [ 15 , 16 ]. With the continuous exposure of corrosion problems worldwide, a large amount of financial resources and manpower are needed to transform failure grounding devices.…”

Section: Introductionmentioning

confidence: 99%

Research Advances of Soil Corrosion of Grounding Grids

Zhang

Liao²,

Xue

et al. 2021

Micromachines

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A grounding grid plays the role of discharging current and balancing voltage to ensure the safety of the power system. However, soil corrosion can damage the grounding grid, which then can endanger the safe operation of power system. This paper reviewed recent research advances of soil corrosion of grounding grid. The cause, mechanism, types, and influencing factors of soil corrosion of grounding grids were summarized, and the corresponding detection technology and protective measures were also introduced. The paper pointed out that soil corrosion is a serious threat to the grounding grid system. Moreover, the impact mechanism of AC stray current, new corrosion detection technology, and better protective measures still need in-depth research.

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Comparative Study on the Corrosion Behaviours of High-Silicon Chromium Iron and Q235 Steel in a Soil Solution

Cited by 8 publications

References 38 publications

Corrosion Resistance of Selected Cast Iron Grades Under Deposit Mining Conditions

Corrosion Resistance of Selected Cast Iron Grades Under Deposit Mining Conditions

Study on the corrosion behaviors of high-silicon chromium iron in acidic and alkaline soil solutions

Research Advances of Soil Corrosion of Grounding Grids

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