H_2O_2和NaOH溶液作用下珍珠腐蚀和结晶的研究

用扫描电镜（ＳＥＭ）观察了珍珠以及用１０％Ｈ２Ｏ２和１ｍｏｌ／ＬＮａＯＨ溶液腐蚀后珍珠样品的横断面和纵剖面形貌。１０％Ｈ２Ｏ２酸性溶液对珍珠从晶界开始并沿晶界形成腐蚀坑。在碱性溶液中，珍珠由于角质蛋白质的降解而被腐蚀，腐蚀也是沿晶界形成腐蚀坑。珍珠表面存在结晶现象，横断面上生成疏松多孔结构并在该结构上生长宝石花状、叶片状以及颗粒状晶体。纵剖面上没有疏松多孔结构。结果表明，珍珠文石晶片结构和成分不均匀性，以及蛋白质在ＣａＣＯ３形核结晶过程中起着引导作用。

Study on corrosion and crystallization on pearl surface in H 2O 2 and NaOH

The scanning electron microscope (SEM) micrographs of the vertical and cross sections of pearls and pearl samples corroded in 10% H 2O 2, 1mol/L NaOH electrolytes display that pearl has the laminated structure of macro layers and micro layers. The corrosion of pearl in 10% H 2O 2 starts and forms the separated corrosion pits along the grain boundaries. In NaOH electrolyte, pearl is etched due to the protein decomposition and forms the corrosion pits along the grain boundaries too. CaCO 3 crystallizes on the pearls and forms porous structures on which the leaf like, flower like and granular grains grow on the cross section. The porous structure is not found on the vertical section. The result reveals the composition and structure heteropic nature of the aragonite grain forming pearl and the protein induces the crystal nucleation.