Cyclic high temperature corrosion studies of carbon
· Molten sulphate-vanadate induced hot corrosion is the main reason of failure of boiler tubes used at high temperatures in thermal power plants. The hot corrosion can be encountered by applying thermal spray coatings on the alloy steels. In this perspective this paper aims to attempt to investigate the effect of carbon nanotubes reinforcement on Cr2O3 composite coatings on hot corrosion
Get Price
Study of the effect of reactive element addition by
The influence of ion-implanted Y Hf Zr and Cr on the oxidation behavior of a Ni-25 wt percent CR alloy at 1000 C has been investigated. The implantation dosage was 5 x 10(exp 16) ions/sq cm. Two methods of implantation have been used. One was to implant ions directly into a clean alloy surface the other was to implant into an approximately 0.6 micron thick Cr2O3 layer formed at 1000 C on
Get Price
Effect of Cr2O3 content on high-temperature dielectric
· Khater has reported that the addition of Cr 2 O 3 as a nucleating agent could promote the formation of germ nuclei and contribute to bulk crystallisation. Rezvani et al and Wu et al 59 have studied the effect of Cr 2 O 3 on the crystallisation of CMAS glass and found that Cr 2 O 3 promotes the precipitation of diopside crystalline phase favouring the precipitation of finer diopside grains.
Get Price
The effect of NiCr intermediate layer on corrosion
Defects such as pores and micro-cracks generally exist in the ceramic layer and lead to corrosion beneath the coating. The present work used plasma-sprayed specimens such as the Cr 2 O 3 ceramic coatings with and without a NiCr intermediate layer and the single NiCr coatings etc. which were deposited on a SUS316L stainless steel substrate.
Get Price
Anti-corrosion mechanism of 2D nanosheet materials in
· The addition of FH-BN results in the formation of protect layer composed of Fe 2 O 3 and Fe 3 O 4. Thus the anti-corrosion performance of 2D materials reinforced epoxy coatings not only depended on the barrier properties but also was affected by the properties of the 2D nanosheet materials.
Get Price
Study of the effect of reactive element addition by
The influence of ion-implanted Y Hf Zr and Cr on the oxidation behavior of a Ni-25 wt percent CR alloy at 1000 C has been investigated. The implantation dosage was 5 x 10(exp 16) ions/sq cm. Two methods of implantation have been used. One was to implant ions directly into a clean alloy surface the other was to implant into an approximately 0.6 micron thick Cr2O3 layer formed at 1000 C on
Get Price
CORROSIONAllen Press
· Hydrogen diffusion and trapping in laser additively manufactured ultra-high strength AerMet100 steel. Xian-zhe Ran Dong Liu et al. Effect of solution aggressiveness on the crackgrowth resistance and cracking mechanism of AA2024-T3.
Get Price
Effect of ZrO2 Additive on the Properties of MgO-Cr2O3
To improve the properties and RH degasser slag corrosion resistance of magnesia-chrome refractory the effect of the addition of ZrO2 was investigated. The results showed that the presence ZrO2 additive can densify the magnesia-chrome samples due to promotion of grain boundary activities and ultimately direct bond formation which improved the high temperature mechanical properties and
Get Price
Influence of 4 wt. Cr addition on the corrosion-wear
Abstract In this work the corrosion-wear synergistic effect for nanocrystalline Fe(Al) 20 wt. Al 2 O 3 /Fe(Al) composites with and without 4 wt. Cr in artificial seawater (3.5 NaCl aqueous solution with 60 kg/m 3 quartz sand) was investigated. The results showed that the main damage behavior of Al 2 O 3 /Fe(Al) composites was a corrosive effect because of its poor corrosion resistance and
Get Price
Effect of Mo Addition on Corrosion Behavior of High
· As to the effect of Mo on the corrosion behavior of HEAs Chou et al. 23 24 and Shang et al. investigated the Co 1.5 CrFeNi 1.5 Ti 0.5 Mo x and CoCrFeNi(W 1–x Mo x) alloys and showed the beneficial effect of Mo. Additionally the beneficial effect of Mo addition on the corrosion behavior of conventional alloys such as stainless steel (SS) 25 26 27 28 29 30 Ni–Cr–Mo 31 32 and Ni–Cr–Mo–Fe alloys has been widely investigated. However the corrosion
Get Price
Corrosion Inhibitors Principles Mechanisms and
· effect of the solution containing organic inhibitor on the metal presents an anodic and cathodic behavior. After the addition of the inhibitor the corrosion potential remains the same but the current decreases from Icor to I cor. Figure 6. Theoretical potentiostatic polarization diagram electrochemical behavior a metal on a solution containing a
Get Price
Study of the effect of reactive element addition by
The influence of ion-implanted Y Hf Zr and Cr on the oxidation behavior of a Ni-25 wt percent CR alloy at 1000 C has been investigated. The implantation dosage was 5 x 10(exp 16) ions/sq cm. Two methods of implantation have been used. One was to implant ions directly into a clean alloy surface the other was to implant into an approximately 0.6 micron thick Cr2O3 layer formed at 1000 C on
Get Price
Effect of Mo Addition on Corrosion Behavior of High
· The corrosion behavior of CoCrFeNiMox alloys was investigated in aqueous environments NaCl and H2SO4 solutions respectively to simulate typical neutral and acidic conditions. The cyclic polarization curves in NaCl and the potentiodynamic curves in H2SO4 clearly reveal the beneficial effects of Mo and the detrimental effect of σ-phase on the corrosion resistance.
Get PriceLaboratory Study on Corrosion Mechanism of Production
· The corrosion problem of a production system has been affecting the normal operation of an in situ combustion project. Because the environment of production system is significantly different in tubing gas liquid and temperature in in situ combustion the problem of the corrosion should be treated differently according to its origin. Based on the main environment of gas-liquid of the
Get Price
Effect of ZrO2 Additive on the Properties of MgO-Cr2O3
To improve the properties and RH degasser slag corrosion resistance of magnesia-chrome refractory the effect of the addition of ZrO2 was investigated. The results showed that the presence ZrO2 additive can densify the magnesia-chrome samples due to promotion of grain boundary activities and ultimately direct bond formation which improved the high temperature mechanical properties and
Get Price
Corrosion Behavior of Alumina Containing Refractory in
compare the corrosion degree between the corundum brick and carbon composite brick samples and the effect of CaF 2 addition on the corrosion degree of bricks was also evalu-ated by this method. The comparison of the diameter dec-rement of corundum brick and carbon composite brick by corrosion was shown in Fig. 1. As can be seen from Fig. 1
Get Price
The Effect of Bath pH and Temperature on the Corrosion
· The aim of this work was to assess the influence of pH and temperature of bath plating on the performance of Ni-Cu/Cr2O3 nanocomposite coatings in a corrosive environment. For this purpose Ni-Cu/Cr2O3 nanocomposite coatings were successfully carried out on the carbon steel by co-electrodeposition method from an aqueous composing of H2O NiSO4 NiCl CuSO4 Na3C6H5O7
Get PriceEffect of Cr2O3 content on high-temperature dielectric
· Khater has reported that the addition of Cr 2 O 3 as a nucleating agent could promote the formation of germ nuclei and contribute to bulk crystallisation. Rezvani et al and Wu et al 59 have studied the effect of Cr 2 O 3 on the crystallisation of CMAS glass and found that Cr 2 O 3 promotes the precipitation of diopside crystalline
Get Price(PDF) Comparative study on tribological and corrosion
In this research the tribological and corrosion protection properties of atmospheric plasma sprayed Cr2O3-20YSZ (CZ) and Cr2O3-20YSZ-10SiC (CZS) composite coatings on 304 L stainless steel substrates were evaluated and compared to pure Cr2O3 (C)
Get Price
Corrosion mechanism of magnesia-chromite refractories by
· An efficient approach for lead extraction from waste funnel glass through the lead smelting process has been proposed. To clarify the effect of funnel glass addition on the degradation of magnesia-chromite refractories by ZnO-containing fayalite slag the corrosion behavior of magnesia-chromite refractories in lead smelting slags with different funnel glass additions from 0wt to 40wt was tested.
Get PriceLecture 12 Mechanisms of Oxidation and Corrosion
· 12.4 Corrosion Corrosion is the deterioration of a material resulting from chemical reaction with its environmenttemperature pressureconcentration of the reactions and productsmechanical stress and erosion Can be regarded as reverse extractive metallurgy Metal oxide (silicate carbonate) Metal Metallurgy reduction Corrosion
Get Price
Effect of ZrO2 Additive on the Properties of MgO-Cr2O3
To improve the properties and RH degasser slag corrosion resistance of magnesia-chrome refractory the effect of the addition of ZrO2 was investigated. The results showed that the presence ZrO2 additive can densify the magnesia-chrome samples due to promotion of grain boundary activities and ultimately direct bond formation which improved the high temperature mechanical properties and
Get PriceThe effect of NiCr intermediate layer on corrosion
· The results of the electrochemical experiments coincide with those of the immersion corrosion tests the 80NiCr intermediate layer decreased the corrosion resistance of Cr 2 O 3 ceramic coated material and the corrosion resistance of the 50NiCr coating was better than those of either the substrate or the 80NiCr coating.
Get Price
Corrosion mechanism of magnesia-chromite refractories by
· An efficient approach for lead extraction from waste funnel glass through the lead smelting process has been proposed. To clarify the effect of funnel glass addition on the degradation of magnesia-chromite refractories by ZnO-containing fayalite slag the corrosion behavior of magnesia-chromite refractories in lead smelting slags with different funnel glass additions from 0wt to 40wt was tested.
Get Price
Journal of Chinese Society for Corrosion and protection
· The addition of 30 Wt Mn into mild steel was very detrimental to its corrosion resistance in aqueous solution. The Fe-30Mn alloy only showed passivation behaviour in NaOH solution while the anodic polarization curves of Fe-30.8Mn-8.2Al alloy exhibited a stable passiwtion region in 1M Na2SO4 10 50 HNO3 and 10 50 NaOH solutions but in 10 HCI and 3.5 NaCI solutions no
Get Price
Lecture 12 Mechanisms of Oxidation and Corrosion
· 12.4 Corrosion Corrosion is the deterioration of a material resulting from chemical reaction with its environmenttemperature pressureconcentration of the reactions and productsmechanical stress and erosion Can be regarded as reverse extractive metallurgy Metal oxide (silicate carbonate) Metal Metallurgy reduction Corrosion
Get PriceCorrosion Inhibitors Principles Mechanisms and
· effect of the solution containing organic inhibitor on the metal presents an anodic and cathodic behavior. After the addition of the inhibitor the corrosion potential remains the same but the current decreases from Icor to I cor. Figure 6. Theoretical potentiostatic polarization diagram electrochemical behavior a metal on a solution containing a
Get Price
The Effect of Chlorine Ion on Metal Corrosion Behavior
· The influence of chloride ion on the corrosion of metal under coating with scratch defects was researched by wire beam electrode (WBE) technology and electrochemical impedance spectroscopy (EIS) technology. The results showed that the current of metal surface could be characterized by the WBE technology. In the case of scratches on the coating the location of the damage always showed
Get Price
Lecture 12 Mechanisms of Oxidation and Corrosion
· 12.4 Corrosion Corrosion is the deterioration of a material resulting from chemical reaction with its environmenttemperature pressureconcentration of the reactions and productsmechanical stress and erosion Can be regarded as reverse extractive metallurgy Metal oxide (silicate carbonate) Metal Metallurgy reduction Corrosion
Get Price
Lecture 12 Mechanisms of Oxidation and Corrosion
· 12.4 Corrosion Corrosion is the deterioration of a material resulting from chemical reaction with its environmenttemperature pressureconcentration of the reactions and productsmechanical stress and erosion Can be regarded as reverse extractive metallurgy Metal oxide (silicate carbonate) Metal Metallurgy reduction Corrosion
Get Price
