A36级船板表面红锈原因及对策
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摘要
在造船业,除了对表面质量有要求外,还要求船板在船舶建造期间不发生腐蚀。但是,船板在热轧时往往会在表面形成疏松的红锈,促进其腐蚀。为了弄清船板产生红锈的原因,对工业生产的A36级船板上的红锈即红色氧化皮进行了金相检验和能谱分析。结果显示:A36级船板的红色氧化皮厚度约25μm,较疏松,其实质是由于热轧时原致密的氧化皮破裂,FeO和Fe_3O_4被氧化为Fe_2O_3。预防船板产生红锈的措施为提高轧制温度、优化除鳞道次和提高轧制速度等。
In addition of surface quality, hull plate is required not to create corrosion during the building of ship in shipbuilding industry. However, loose red rust( scale) forms frequently on hull plate during the hot rolling, thus promoting its being corroded. The red scale on a commercially produced A36 grade hull plate was subjected to metallographic examination and energy spectrum analysis for the purpose of discovering the reason why red scale formed. The result showed that the red scale on A36 grade hull plate was as thick as about 25 μm and more loose,and its formation is substantially that FeO and Fe_3 O_4 are oxidized into Fe203 because of original compact scale breaking during the hot-rolling. The countermeasures involved raising rolling temperature, optimizing descaling pass, increasing rolling speed, etc.
In addition of surface quality, hull plate is required not to create corrosion during the building of ship in shipbuilding industry. However, loose red rust( scale) forms frequently on hull plate during the hot rolling, thus promoting its being corroded. The red scale on a commercially produced A36 grade hull plate was subjected to metallographic examination and energy spectrum analysis for the purpose of discovering the reason why red scale formed. The result showed that the red scale on A36 grade hull plate was as thick as about 25 μm and more loose,and its formation is substantially that FeO and Fe_3 O_4 are oxidized into Fe203 because of original compact scale breaking during the hot-rolling. The countermeasures involved raising rolling temperature, optimizing descaling pass, increasing rolling speed, etc.
引文
[1]孔冠宏,张瑞堂,冯锐,等.热处理对AH36船板钢显微组织和力学性能的影响[J].热处理,2013,28(6):30-31.
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[4]孙彬,刘振宇,邱以清,等.低碳钢表面FeO层空气条件下等温转变行为的研究[J].钢铁研究学报,2010,22(2):34-40.
[5]HIDAKA Y, ANRAKU T, OTSUKA N. Deformation of Iron Oxides upon Tensile Tests at 600-1 250℃[J]. Oxidation of Metals, 2003, 59(1-2):97-113.
[6]陈连生,卢珺玮,宋进英,等.钢板表面氧化铁皮缺陷形貌及产生原因分析[J].钢铁钒钛,2013,34(1):86-92.
[2]冈田光,深川智机,石原晴彦,等.热轧和高压水除鳞等条件对生成红色氧化铁皮的影响[J].浙江冶金,1997(4):50-59.
[3]闵洪刚,金月桂.热轧钢板红色氧化铁皮的浅析[C]//中国钢铁年会,2001.
[4]孙彬,刘振宇,邱以清,等.低碳钢表面FeO层空气条件下等温转变行为的研究[J].钢铁研究学报,2010,22(2):34-40.
[5]HIDAKA Y, ANRAKU T, OTSUKA N. Deformation of Iron Oxides upon Tensile Tests at 600-1 250℃[J]. Oxidation of Metals, 2003, 59(1-2):97-113.
[6]陈连生,卢珺玮,宋进英,等.钢板表面氧化铁皮缺陷形貌及产生原因分析[J].钢铁钒钛,2013,34(1):86-92.