食品接触用不锈钢制品在不同浓度含氯模拟物中重金属迁移行为研究

Migration Behavior of Heavy Metals in Stainless Steel with Different Concentrations of Chlorine

国家标准规定不锈钢制品采用4%乙酸为迁移模拟物进行检测,并未考虑在含氯环境下重金属迁移情况。本文以SUS304不锈钢和SUS201不锈钢为研究对象,砷、铬、镉、铅、镍5种金属元素为表征指标,研究两种不锈钢在含氯模拟物中的重金属迁移行为。结果表明,氯离子对两种不锈钢均有加快腐蚀的作用;氯离子浓度越大,重金属迁移量越大;氯离子浓度持续增加,重金属迁移速率减缓;重复试验对重金属迁移试验影响较小;在含氯模拟物中,SUS304不锈钢重金属迁移总量远小于同等条件下的SUS201不锈钢。

The national standard stipulates that stainless steel products are tested using 4%acetic acid as a migration mimetic,and heavy metal migration in a chlorine-containing environment is not considered.In this paper,SUS304 stainless steel and SUS201 stainless steel were studied.The five metal elements of Arsenic,Chromium,Cadmium,Lead and Nickel were used as characterization indexes to study the migration behavior of heavy metals in chlorine-containing simulants.The results show that chloride ions have accelerated corrosion effects on both stainless steels;The larger the chloride ion concentration,the greater the migration of heavy metals;Chloride ion concentration continues to increase,heavy metal migration rate slows down;Repeat the test migration test less impact on heavy metal;In the chlorine-containing simulant,the total amount of heavy metal migration of SUS304 stainless steel is much smaller than that of SUS201 stainless steel under the same conditions.