【摘要】 不锈钢304和316是换热器常用材料,研究CaCO3析晶污垢在这两种金属表面的生长特性是抗垢研究的第一步。在35℃0.05 g/L CaCO3溶液中,通过静态反应法研究CaCO3在两种金属表面的生长特性,采用称重法获得不同时间结垢重量,采用扫描电子显微镜(SEM)获得不同时间污垢的微观形貌。结果表明:在相同条件下,不锈钢304和316表面结垢量很接近;pH升高不仅使结垢量增多而且促进四方形文石和方解石的形成,并且文石不断重结晶形成热力学最稳定晶型(方解石);pH升高使表面产生更多晶核,并且晶体分布没有规律、交叉重叠生长。更多还原

【Abstract】 Stainless steel 304 and 316 are commonly-used materials for heat exchangers.To study the growth characteristics of CaCO3 crystallization fouls on the surface of both metals is the first step for studying the means to resist the fouling.In 0.05 g/l CaCO3 solution at 35 ℃,by employing the static-state reaction method,the authors studied the growth characteristics of CaCO3 on the surface of both metals.The weights of fouls were obtained at different times by adopting the weighing method and the microscopic morphology of the fouls at different times was acquired by using a scanning electronic microscope(SEM).The research results show that under a same condition,the weights of fouls on the surface of stainless steel 316 and 304 are very close.To enhance the pH value can not only increase the weight of fouls but also promote the formation of square aragonite and calcite,and aragonite can increasingly recrystallize into the most stable crystal(calcite) in thermodynamics.To increase the pH value can make the metallic surface produce more crystal nuclei and the crystal distribution is irregular,resulting in a cross and superimposed growth.更多还原