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-rich σ phase. The chromium-rich σ phase was prone to precipitate and caused chromium depletion around it. In corrosive solutions, the electrochemical reaction occurred between the σ phase and the chromium-depleted region, led to the ionization of chromium in the chromium-depleted region and the falling off of the chromium-rich σ phase, and eventually resulted in the excessive precipitation of chromium ion.