Effects of Temperature on Fretting Corrosion Between Alloy 690TT and 405 Stainless Steel in Pure Water

The effect of normal force on fretting wear behavior of zirconium alloy tube mated with grid dimple in simulated primary water of pressurized water reactor nuclear power plant was investigated. Results showed that the maximum wear depth, wear volume and wear coefficient of Zr alloy tube in simulated primary water at 315 °C gradually increased with increasing normal force, while the friction coefficient gradually decreased. Fretting process could be divided into four stages according to the variation of friction coefficient during test. When normal force exceeds 30 N, the fretting regime would transition from gross slip regime to partial slip regime after 3 × 10 7 cycles. Delamination was aggravated with increasing normal force, while abrasive wear became slighter. A thicker third-body layer with monoclinic ZrO 2 was formed by the tribo-sintering mechanism under higher normal force. In addition, the schematic evolution processes of delamination and third-body layer formation were displayed according to morphology observation. Keywords Zirconium alloy tube • Fretting wear • Grid-to-rod • High-temperature pressurized water • Normal force

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“…The fretting wear test was carried out in a HTP fretting wear system which had been introduced in detail in Refs. [32,33]. As shown in Fig.…”

Section: Fretting Wear Testmentioning

confidence: 84%

Effect of Normal Force on Fretting Wear Behavior of Zirconium Alloy Tube in Simulated Primary Water of PWR

Zhang

Jiang

Ming

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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“…Due to the pH value of the secondary side water in the PWR being usually controlled at 9.0~10.0 [3,4], the solution can act as an electrolyte for the electrochemical corrosion of the SG tube. Combined with fretting, the mechanical removal of passive oxide film accelerated the material's deterioration [5].…”

Section: Introductionmentioning

confidence: 99%

“…The other is the chemical degradation which can be accelerated by fretting. In recent years, many investigations on fretting corrosion of Inconel 690TT have been carried out with the fretting parameters including displacement amplitude [ 6 , 7 ], normal force [ 6 , 7 , 8 ], cycle number [ 9 , 10 ], temperature [ 3 , 11 , 12 , 13 ], and microstructure evolution [ 14 , 15 , 16 , 17 , 18 ]. However, the electrochemical effects are ignored under such a corrosive environment, especially the evolution of passive film.…”

Section: Introductionmentioning

confidence: 99%

Effects of Normal Force on the Tribocorrosion Behavior of a Nickel-Based Superalloy in Alkaline Solution: An Electrochemical Study

Xin

Jiang

2020

Materials

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The tribocorrosion behavior of Inconel 690TT in NaOH (pH = 9.8) solution at different normal forces was investigated by an electrochemical method. The results indicated that normal force had a great effect on the tribocorrosion behavior and mechanism. When normal force increased from 15 to 30 N, fretting regime was in gross slip regime (GSR), and wear volume gradually increased. When normal force further increased to 45 N, wear volume significantly decreased due to the fretting regime changing from GSR to partial slip regime (PSR). When fretting ran in GSR, the corrosion resistance decreased with the negative shift of open circuit potential (OCP). However, when the fretting regime changed to PSR, the corrosion reaction significantly decreased due to the adhesive wear. Fretting wear broke the passive film at the contacting surface, which caused the worn surface to be more active and prone to corrosion. However, the broken passive film was quickly repaired in subsequent oxidation. The break and repair of passive film strongly depended on normal force. In GSR, the increase in normal force aggravated the break of passive film. In PSR, the passive film was not easy to break with a further increase of normal force.

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“…Fretting corrosion is a type of fretting damage in which chemical reaction predominates between the constituents of contacting surface and environment [3]. Fretting corrosion is one of main failure modes in SG, mainly occurring in a limited position between the heat transfer tube and its support frame in high-temperature and high-pressure (HTHP) water [4][5][6]. At this stage, the research on fretting corrosion in simulated secondary side HTHP water has become mainstream, which can provide reference for the safe operation of heat transfer tubes under real working condition.…”

Section: Introductionmentioning

confidence: 99%

Surface Oxidation and Subsurface Microstructure Evolution of Alloy 690TT Induced by Partial Slip Fretting Corrosion in High-Temperature Pure Water

Xin

Han

Ligong

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The surface oxidation and subsurface microstructure evolution of Alloy 690TT can occur during partial slip fretting corrosion in high-temperature pure water. Detailed characterization methods such as laser scanning confocal microscopy, scanning electron microscopy, electron probe micro-analyzer, and transmission electron microscopy were used to reveal the related mechanism. The results showed that Cr 2 O 3 oxides together with a small number of spinel oxides were formed in sticking region since a small quantity of high-temperature water could pass through the gaps between the asperities to oxidize the materials. Widespread distribution of oxides in microslip region consisted of (Ni, Fe)Cr 2 O 4 , because Ni 2+ and Fe 2+ ions could react with Cr 2 O 3 to generate a small amount of non-stoichiometric spinel oxides. The oxides around micropitting in microslip region consisted of double-layer structure. The outermost layer contained (Fe, Cr)-rich oxides due to the effect of fretting leading to mechanical mixing between Cr 2 O 3 and (Ni, Fe)(Fe, Cr) 2 O 4 . The inner layer consisted of (Fe, Ni)-rich oxides owing to the consumption of Cr 2 O 3 by the reaction with Ni 2+ and Fe 2+ ions. The reciprocating motion of oxide particles in microslip region resulted in the stress-strain supporting the recrystallization for the formation and development of a tribologically transformed structure in subsurface and plowing effect by fretting in surface.

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Effects of Temperature on Fretting Corrosion Between Alloy 690TT and 405 Stainless Steel in Pure Water

Cited by 26 publications

References 33 publications

Effect of Normal Force on Fretting Wear Behavior of Zirconium Alloy Tube in Simulated Primary Water of PWR

Effect of Normal Force on Fretting Wear Behavior of Zirconium Alloy Tube in Simulated Primary Water of PWR

Effects of Normal Force on the Tribocorrosion Behavior of a Nickel-Based Superalloy in Alkaline Solution: An Electrochemical Study

Surface Oxidation and Subsurface Microstructure Evolution of Alloy 690TT Induced by Partial Slip Fretting Corrosion in High-Temperature Pure Water

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