CAJ | 학술논문

为了解决钢铁炉窑低温烟气余热利用中换热器金属材料的腐蚀问题，采用自主设计的耐腐蚀特性试验台对五种常见金属材料进行了耐腐蚀特性研究，采用壁厚测试、 SEM扫描电镜及EDS能谱检测仪对腐蚀层厚度及元素进行了检测，并对金属材料的腐蚀机理做了详细分析。结果表明：在轧钢加热炉低温烟气环境下，20 g钢和ND钢均有较严重腐蚀， ND钢耐腐蚀性强于20 g钢，三种不锈钢腐蚀情况差异不大且未见明显腐蚀，从微观检测结果看，不锈钢的耐腐蚀性能由大到小依次为316L＞316＞304，腐蚀速率为35～190μm／a，引起这些金属材料腐蚀的主要原因为酸结露腐蚀。
위료해결강철로요저온연기여열이용중환열기금속재료적부식문제，채용자주설계적내부식특성시험태대오충상견금속재료진행료내부식특성연구，채용벽후측시、 SEM소묘전경급EDS능보검측의대부식층후도급원소진행료검측，병대금속재료적부식궤리주료상세분석。결과표명：재알강가열로저온연기배경하，20 g강화ND강균유교엄중부식， ND강내부식성강우20 g강，삼충불수강부식정황차이불대차미견명현부식，종미관검측결과간，불수강적내부식성능유대도소의차위316L＞316＞304，부식속솔위35～190μm／a，인기저사금속재료부식적주요원인위산결로부식。
In order to solve corrosion problem of heat exchanger metal materials in waste heat utiliza-tion of low-temperature flue gas of steel furnaces, low-temperature corrosion resistance properties of five metal materials were studied using self-design test rig, the wall thickness testing, thickness and element of corrosion layer was detected by SEM and EDS, and the corrosion mechanism of metal mate-rials was analyzed in detail.The results show that in the flue gas of rolling steel heating furnace, 20g steel and ND steel has serious corrosion, and corrosion resistance properties of ND steel is higher than20g.Corrosion of three kinds of stainless steel has little difference and they haven't evident corro-sion.From the microscopic results, the corrosion resistance of stainless steel in order is 316L>316>304, and the corrosion rate is 35-190μm/a, and the main reason that causes corrosion of these mate-rials is acid dew corrosion.