镀锌钢中表面镀锌层厚度检测方案(辉光放电光谱)

GDS-Series Spectroscopv Performance Note QDP Analysis ofGalvanized Stee ·Galvanizing Thickness and Coating Weight ·Composition on the Coating and Substrate ·Surface Treatments The application of zinc and zinc-alloy coatings to steel provides both galvanic and barrier corrosionprotection. Galvanized coatings can be applied by either continuous hot-dip coating or electroplating.Hot-dip coatings include galvanized (zinc)， galvannealed， Al-Zn with 55% aluminum and Zn-Al with 5%aluminum. Electroplated coat)iantgs include zinc and Zn-Ni. The choice of coating depends on theapplication. Thin coatings provide sufficient corrosion resistance where the corrosion rate is low， such asinterior panels and painted parts. Thick coatings are needed where corrosion rate is high and longservice life is required， such as marine or underground applications. The analysis conforms to and is inaccordance with ISO 16962. Name Depth， umTotal coat wt， g/m?Zn%AI% Hot Dip-113.52 89.10 94.415.57 FeZn Depth (micrometers) Name Depth， um Total coat wt， g/m² Zn% AI% Hot Dip-1 13.52 89.10 94.41 5.57 Hot Dip-2 13.59 88.93 94.43 5.56 Hot Dip-3 12.88 84.14 94.23 5.75 Hot Dip-4 11.84 77.30 93.88 6.10 Hot Dip-5 12.26 79.32 94.04 5.94 Mean 12.82 83.76 94.20 5.78 Rsd 5.99 6.45 0.25 4.071 Galvannealed Coating： Galvanneal-18.01 56.98 89.839.970.19 利用力可LECO GDS850辉光光谱仪分析镀锌钢板表面镀层的厚度和重量及每种镀层元素随深度的分布。