430不锈钢锅干烧后铬离子析出量超标的原因
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摘要
某430不锈钢锅在干烧试验后进行重金属迁移量检验时,发现其铬离子析出量严重超标,利用化学成分分析、显微组织观察和电化学性能测试等方法分析了超标原因。结果表明:430不锈钢锅在干烧时处于富铬σ相析出温度范围,富铬σ相易于析出并导致其周围贫铬;在腐蚀溶液中,富铬σ相和贫铬区之间发生电化学反应,导致贫铬区中铬的离子化和富铬σ相的脱落,最终导致铬离子析出量超标。
The excessive amount of chromium ion precipitation in 430 stainless steel pot after dry burning test was determined by heavy metal migration test.The reason for exceeding was analyzed by chemical composition analysis,microstructure observation,electrochemical property testing,and so on.The results show that during the dry burning,the 430 stainless steel pot was in the precipitation temperature range of chromium-richσphase.The chromium-richσphase was prone to precipitate and caused chromium depletion around it.In corrosive solutions,the electrochemical reaction occurred between theσphase and the chromium-depleted region,led to the ionization of chromium in the chromium-depleted region and the falling off of the chromium-richσphase,and eventually resulted in the excessive precipitation of chromium ion.
The excessive amount of chromium ion precipitation in 430 stainless steel pot after dry burning test was determined by heavy metal migration test.The reason for exceeding was analyzed by chemical composition analysis,microstructure observation,electrochemical property testing,and so on.The results show that during the dry burning,the 430 stainless steel pot was in the precipitation temperature range of chromium-richσphase.The chromium-richσphase was prone to precipitate and caused chromium depletion around it.In corrosive solutions,the electrochemical reaction occurred between theσphase and the chromium-depleted region,led to the ionization of chromium in the chromium-depleted region and the falling off of the chromium-richσphase,and eventually resulted in the excessive precipitation of chromium ion.
引文
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[5]邵泽斌,陈海涛,郎宇平,等.430铁素体不锈钢晶间腐蚀敏感性评测方法及影响因素[J].特殊钢,2012,33(5):57-60.
[6]张德康.不锈钢局部腐蚀[M].北京:科学出版社,1982.
[7]万章.铁素体不锈钢晶间腐蚀问题的探讨[J].石油化工腐蚀与防护,2015,32(4):62-64.
[8]陈惠波,黄子东,江乙逵,等.晶间腐蚀对304不锈钢食具铬离子析出量的影响[J].现代食品科技,2017,33(6):240-247.
[2]李晓波.国内铁素体不锈钢的最新发展[J].铸造设备研究,2006(4):52-54.
[3]赵敏,寇海娟.国内外食品接触用不锈钢制品法规的分析比较[J].科技致富向导,2014(24):187-188.
[4]温军国,郑弃非,涂思京,等.热处理对铁素体不锈钢组织和性能的影响[J].稀有金属,2006,30(增刊1):152-154.
[5]邵泽斌,陈海涛,郎宇平,等.430铁素体不锈钢晶间腐蚀敏感性评测方法及影响因素[J].特殊钢,2012,33(5):57-60.
[6]张德康.不锈钢局部腐蚀[M].北京:科学出版社,1982.
[7]万章.铁素体不锈钢晶间腐蚀问题的探讨[J].石油化工腐蚀与防护,2015,32(4):62-64.
[8]陈惠波,黄子东,江乙逵,等.晶间腐蚀对304不锈钢食具铬离子析出量的影响[J].现代食品科技,2017,33(6):240-247.