Corrosion behavior and ΔS-T relation of LaFe13−−Co Si C  compounds near room temperature

Hu, Jie; Zhang, Min; Long, Yi; Fu, Song; Wang, Huasheng; Zhong, Kexiang

doi:10.1016/j.jmmm.2014.10.133

Cited by 22 publications

(8 citation statements)

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“…In terms of anodic potentials > 0.4 V a sharp decline in the value of the anodic current density (ipass ≈ 510 -4 A/cm 2 ) has been observed. Similar tendency to active dissolution without a transition to passivation up to 0 V has been shown by Hu J. et al [24] for measurements in distilled water. Most of the tests conducted on such alloys are carried out in buffer solutions in the pH range of 4 -8 [25], but according to Zhang et al [26] and Wolff et al [27] researches even after long term immersion in alkaline solution the pitting corrosion is not observed or are observed in small amounts [24].…”

Section: Resultssupporting

confidence: 86%

“…Similar tendency to active dissolution without a transition to passivation up to 0 V has been shown by Hu J. et al [24] for measurements in distilled water. Most of the tests conducted on such alloys are carried out in buffer solutions in the pH range of 4 -8 [25], but according to Zhang et al [26] and Wolff et al [27] researches even after long term immersion in alkaline solution the pitting corrosion is not observed or are observed in small amounts [24]. This paper presents the results of measurements carried out in a strongly acidified phosphate solution (pH = 3)the selection of the test solution has been driven by the fact that the alloys containing rare earth elements in phosphate solutions with this pH value easily passivate and the passive layer is made of hard-soluble phosphate compounds and even though the local corrosion (pitting corrosion) causing material damage [11,14,15,25].…”

Section: Resultssupporting

confidence: 86%

“…However, LaFe11.00Co0.8Si1.2 in comparison to LaFe10.72Co1.08Si1.2 is characterized with significant (almost double) reduction of the Epit value (Fig. 3, Table 4)smaller number of pits on a material containing a larger amount of Co also has been observed in Hu J. et al research [24]. The comparative study of the sample surface before and after corrosion test has been carried out using an optical microscope with EPI 3D analyzer.…”

Section: Resultsmentioning

confidence: 53%

“…The changes in chemical composition based on the effect of galvanic coupling between the various phases. The small amounts of Mn, Co and C, have an effect on the corrosion rate, and also arranges operating temperature of alloys based on La(Fe,Si,X)13 [17,23,24].…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Comparative Characteristics of La(Fe,Si)13 Type Materials with Different Content of Co in Acidified Phosphate Environment in Presence of Cl- Ions

Klimecka-Tatar

Pawłowska²,

Radomska³

et al. 2019

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In the paper the electrochemical characteristics of alloys based on La(Fe,Si)13 phase have been presented. The material for research was the LaFe11.8-xCoxSi1.2 alloy with different cobalt content. Presented electrochemical characteristics provide information about pitting corrosion. This kind of corrosion is one of the most common local corrosion, it is especially undesirable for multi-phase alloys based on rare earth elements, as it contributes to the sudden and unexpected destruction of the surface of the material in working conditions. In the paper the results of potentiokinetic corrosion tests determined for LaFe10.72Co1.08Si1.2 and LaFe11.00Co0.8Si1.2 alloys in acidified phosphate solution (pH = 3) with different addition of chloride ions (Cl-) have been presented. Also analysis of alloys surface before and after corrosion measurement have been presented. The surface analysis have been carried out on the basis of profilometric roughness tests and optical microscopy observation. The studies have shown low resistance of LaFe10.72Co1.08Si1.2 and LaFe11.00Co0.8Si1.2 alloys to pitting corrosion, which, however, increases with Co content increase. DOI: http://dx.doi.org/10.5755/j01.ms.25.3.19536

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Section: Resultssupporting

confidence: 86%

Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical Comparative Characteristics of La(Fe,Si)13 Type Materials with Different Content of Co in Acidified Phosphate Environment in Presence of Cl- Ions

Klimecka-Tatar

Pawłowska²,

Radomska³

et al. 2019

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“…They proposed a first model mechanism for the corrosion process which is based on a galvanic coupling effect between the different phases. Small amounts of either Mn or Co and C which are usually added to adjust the working temperature range of La(Fe,Si,X) 13 obviously have only marginal effects on the corrosion rates [20,21]. Moreover corrosion degradation has been shown to deteriorate the magnetocaloric effect of the material [22,19].…”

Section: Introductionmentioning

confidence: 99%

Exploring corrosion protection of La-Fe-Si magnetocaloric alloys by passivation

2016

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Outstanding Comprehensive Performance of La(Fe, Si)₁₃H_y/In Composite with Durable Service Life for Magnetic Refrigeration

Wang

Zhang

Liu

et al. 2018

Adv Elect Materials

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temperature, has become a promisingly alternative technology to the existing vapor-compression refrigeration due to its energy efficiency and environment friendly. [4][5][6] As the core part of magnetic refrigeration, the comprehensive performance including MCE, thermal conductivity (λ), preparation and fabrication, corrosion resistance, and thermal and magnetic field cycling stabilities for magnetocaloric materials greatly affect the performance of the magnetic refrigerator. [7,8] Pure Gd, as the benchmark magnetic refrigerant, is commonly used in the active magnetic regenerator prototypes. [9,10] In particular, Gd metal could be produced into different shapes due to its good mechanical properties, such as thin plate, sphere, and microwire, and it has been demonstrated that microwire is more desirable for realizing a higher cooling performance. [11][12][13][14][15][16] However, Gd metal also has its disadvantages such as relatively low magnetic entropy change (ΔS M ), limited availability, and expensive price that hinder its large-scale commercialization. Therefore, a great number of magnetic materials with large MCE around room temperature have been extensively explored in the past decades. [2,6,[17][18][19][20] Unfortunately, although these new materials exhibit much better MCE than that of Gd, they still have severe shortcomings such as hard preparation Magnetic refrigeration based on magnetocaloric effect (MCE) has become a promisingly alternative technology to the conventional vapor-compression refrigeration. A great number of magnetic materials have been reported to exhibit larger MCE than that of the benchmark magnetic refrigerant Gd.However, these materials still have severe shortcomings on the "Non-MCE" properties, such as hard preparation and fabrication, low thermal conductivity λ, and poor corrosion resistance and cycling stabilities, which hinder the practical application of these materials. In this paper, a novel La(Fe, Si) 13 H y / In composite which is prepared by a readily available hot pressing method is demonstrated to exhibit an outstanding comprehensive performance with durable service life in various aspects. Noteworthily, the ΔS M does not decrease but increases with increasing nonmagnetic In metal. This advantageous anomaly is related to the strengthening of the first-order itinerant electron metamagnetic transition induced by residual compression stress and surrounded constraints in the composite. The present results make La(Fe, Si) 13 H y /In composite the most attractive alternative to Gd for magnetic refrigeration. Moreover, this work also provides a feasible way to solve the serious issues toward applications for La(Fe, Si) 13 -based materials and other brittle magnetocaloric materials.

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Corrosion behavior and ΔS-T relation of LaFe13−−Co Si C compounds near room temperature

Cited by 22 publications

References 20 publications

Electrochemical Comparative Characteristics of La(Fe,Si)13 Type Materials with Different Content of Co in Acidified Phosphate Environment in Presence of Cl- Ions

Electrochemical Comparative Characteristics of La(Fe,Si)13 Type Materials with Different Content of Co in Acidified Phosphate Environment in Presence of Cl- Ions

Exploring corrosion protection of La-Fe-Si magnetocaloric alloys by passivation

Outstanding Comprehensive Performance of La(Fe, Si)₁₃H_y/In Composite with Durable Service Life for Magnetic Refrigeration

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Corrosion behavior and ΔS-T relation of LaFe13−−Co Si C compounds near room temperature

Cited by 22 publications

References 20 publications

Electrochemical Comparative Characteristics of La(Fe,Si)13 Type Materials with Different Content of Co in Acidified Phosphate Environment in Presence of Cl- Ions

Electrochemical Comparative Characteristics of La(Fe,Si)13 Type Materials with Different Content of Co in Acidified Phosphate Environment in Presence of Cl- Ions

Exploring corrosion protection of La-Fe-Si magnetocaloric alloys by passivation

Outstanding Comprehensive Performance of La(Fe, Si)13Hy/In Composite with Durable Service Life for Magnetic Refrigeration

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Outstanding Comprehensive Performance of La(Fe, Si)₁₃H_y/In Composite with Durable Service Life for Magnetic Refrigeration