Metal Finishing Guide Book

2012-2013

Issue link: https://metalfinishing.epubxp.com/i/98750

Contents of this Issue

Navigation

Page 116 of 903

Figure 1. Periodic Table of Elements���note Zirconium���s position. ceramic bake ware, or when fused as jewelry, cubic zirconia. Imagine cladding a reactive metal in an inert substance like cubic zirconia, then applying a corrosionresistant organic coating. This is the promise of the modern transition metal coatings, once referenced as nano-ceramic. Figure 2 shows the relative thicknesses of the pretreatments. When gauging relative thickness of applied pretreatments, zinc phosphates are by far the heaviest and thickest pretreatments, depositing a mineral layer of some 1000 to 5000 nanometers (nm) in thickness. (Footnote 1) Iron phosphate applies typically a 250 to 500 nm thick coating. TMC pretreatments are approximately 50 nm, with some approaching 200 nm in thickness. They are the smallest, thinnest of the pretreatments, and are much thinner than the traditional metal phosphates they replace. Figure 2. Relative coating thickness of transitional metal coatings, iron phosphate and zinc phosphate. 113

Articles in this issue

view archives of Metal Finishing Guide Book - 2012-2013