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Wear Performance Evaluation Of Chrome Carbide Overlays (Ccos)

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Erosion-corrosion plays an important role in determining the durability of the erosive/corrosive slurry handling equipment. The combined action of erosion and corrosion produces a high degradation rate. Material loss rate due to erosion-corrosion is usually significantly higher than the sum of material loss rate due to pure erosion and pure corrosion acting separately. The degradation in erosion-corrosion is primarily by matrix extrusion due to abrasive particle impact.

Product Number: 51322-17748-SG
Author: Md. Aminul Islam, Jiaren (Jimmy) Jiang, Yongsong Xie
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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Material loss due to erosion-corrosion decreases the throughput and useful life of the equipment. Simultaneous action of erosion and corrosion is responsible for the high degradation of the hydro-transport equipment. To minimize the operational cost, based on the degradation severity in a specific operation, different classes of materials are being used for different applications. Pipeline steels (i.e. plain carbon, API steels), for example, are relatively cheap and do not provide good wear resistance. These types of steels are typically used for less severe applications such as tailings. Chrome white irons (CWIs) and WC-based overlays, on the other hand, are usually used for more severe wear conditions (i.e. hydro-transport pipeline). In this study, we have evaluated the erosion-corrosion performance of 4 homogeneous materials (pipeline and abrasion-resistant steels) and 5 materials containing different types and amounts of carbide (chrome white iron and WC-based overlay). Erosion-corrosion test was performed inside a slurry pot at 45°C, in an aqueous slurry containing 35wt% natural silica sand and 3.5wt% NaCl. The wear performance of these materials was evaluated based on the total erosion-corrosion (E-C) rate as well as the separate components of synergistic effect. In the current test condition, WC-based overlays demonstrate the best erosion-corrosion resistance. For all carbide-containing materials, it was found that matrix wear influences the extent of carbide degradation. For the carbides to provide good erosion-corrosion resistance, the surrounding matrix that supports the carbide should have sufficient wear and corrosion resistance. Dominant wear mechanisms for homogeneous and carbide-containing materials have also been identified.

Material loss due to erosion-corrosion decreases the throughput and useful life of the equipment. Simultaneous action of erosion and corrosion is responsible for the high degradation of the hydro-transport equipment. To minimize the operational cost, based on the degradation severity in a specific operation, different classes of materials are being used for different applications. Pipeline steels (i.e. plain carbon, API steels), for example, are relatively cheap and do not provide good wear resistance. These types of steels are typically used for less severe applications such as tailings. Chrome white irons (CWIs) and WC-based overlays, on the other hand, are usually used for more severe wear conditions (i.e. hydro-transport pipeline). In this study, we have evaluated the erosion-corrosion performance of 4 homogeneous materials (pipeline and abrasion-resistant steels) and 5 materials containing different types and amounts of carbide (chrome white iron and WC-based overlay). Erosion-corrosion test was performed inside a slurry pot at 45°C, in an aqueous slurry containing 35wt% natural silica sand and 3.5wt% NaCl. The wear performance of these materials was evaluated based on the total erosion-corrosion (E-C) rate as well as the separate components of synergistic effect. In the current test condition, WC-based overlays demonstrate the best erosion-corrosion resistance. For all carbide-containing materials, it was found that matrix wear influences the extent of carbide degradation. For the carbides to provide good erosion-corrosion resistance, the surrounding matrix that supports the carbide should have sufficient wear and corrosion resistance. Dominant wear mechanisms for homogeneous and carbide-containing materials have also been identified.

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