论文部分内容阅读
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。
Stainless steel 304 and 316 are common materials for heat exchangers. Studying the growth characteristics of CaCO3 crystallized fouling on these two metal surfaces is the first step of anti-fouling research. In 35 ℃ 0.05 g / L CaCO3 solution, the static reaction method was used to study the growth characteristics of CaCO3 on the two metal surfaces. The weight of fouling was obtained by weighing method at different times. The microscopic observation of the fouling at different times was carried out by scanning electron microscope (SEM) Topography The results show that under the same conditions, the scaling of stainless steel 304 and 316 surface is very close; the increase of pH not only increases the amount of scaling but also promotes the formation of tetragonal aragonite and calcite, and the recrystallization of aragonite continuously forms the thermodynamically stablest form (Calcite). The increase of pH makes the surface produce more nuclei, and the crystal distribution is irregular and the growth is overlapped and overlapped.