Effects of salt and ash deposits on corrosion behaviour of Ni-25Cr in Ar-60CO2-20H2O gas at 650 oC

IF 1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials at High Temperatures Pub Date : 2023-05-31 DOI:10.1080/09603409.2023.2219876

Yuchen Cai, Xuteng Xi, Jianqiang Zhang, B. Gleeson, D. Young

引用次数: 0

Abstract

ABSTRACT A Ni-25Cr (wt.%) alloy coated with the salts and mixtures of these salts with an industrial coal ash was exposed to Ar-60CO2-20 H2O at 650 °C for 300 h. The alloy without any deposit developed a uniform internal oxidation zone (IOZ) and an external metallic nickel layer surmounted by a thin NiO scale. Salt deposits changed the scale constituents and morphology. Predominantly, a duplex scale of NiO over a Cr2O3 layer grew with an underlying IOZ containing large Cr-rich oxide precipitates. Under a deposit of ash plus salts, the basic reaction morphology was the same as in the gas-only case, but the oxide layer was non-uniform. Local voids were formed within the alloy beneath chloride plus ash deposits. Under ash with sulphates, the alloy formed both partially protected areas and non-protective multi-layered scales. Spherical ash particles were enveloped by NiO in both salt-ash deposits.

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盐和灰沉积对Ni-25Cr在650℃Ar-60CO2-20H2O气体中腐蚀行为的影响

将Ni-25Cr (wt.%)合金涂上盐，并将这些盐与工业煤灰混合，在650℃下暴露于Ar-60CO2-20 H2O中300小时。无沉积的合金内部有均匀的氧化区，外部有金属镍层，表面有薄薄的NiO层。盐沉积改变了水垢的组成和形态。主要是在Cr2O3层上形成NiO的双相层，其下IOZ含有大量富cr氧化物沉淀。在灰加盐沉积下，反应的基本形态与纯气体情况相同，但氧化层不均匀。在氯化物和灰分沉积物下面的合金内部形成了局部空洞。在含硫酸盐的灰下，合金形成了部分保护区域和非保护的多层鳞片。在两种盐灰矿床中，球形灰颗粒均被NiO包裹。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials at High Temperatures 工程技术-材料科学：综合

CiteScore

1.90

自引率

15.40%

发文量

审稿时长

>12 weeks

期刊介绍： Materials at High Temperatures welcomes contributions relating to high temperature applications in the energy generation, aerospace, chemical and process industries. The effects of high temperatures and extreme environments on the corrosion and oxidation, fatigue, creep, strength and wear of metallic alloys, ceramics, intermetallics, and refractory and composite materials relative to these industries are covered. Papers on the modelling of behaviour and life prediction are also welcome, provided these are validated by experimental data and explicitly linked to actual or potential applications. Contributions addressing the needs of designers and engineers (e.g. standards and codes of practice) relative to the areas of interest of this journal also fall within the scope. The term ''high temperatures'' refers to the subsequent temperatures of application and not, for example, to those of processing itself. Materials at High Temperatures publishes regular thematic issues on topics of current interest. Proposals for issues are welcomed; please contact one of the Editors with details.