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Zn coating I - Coating defects


Figure 1: SEM images of cross sections of samples. (a) Galvanised – (b) ZnFe.

Defect name: Zn coating
Record No.: 1679
Type of defect (Internal/Surface): Surface
Defect classification: Coating defects
Steel name: Steel
Steel composition in weight %: No data.
Note:  Commercial galvanized steel and Zn-Fe electroplated steel were used in present study. Zn-Fe alloy coating was electrodeposited from an alkaline solution using a current density of 30mA/cm2. In both cases, 40 x 40 mm samples were used in all the tests. Cross-sections of the coatings were inspected by scanning electron microscopy (SEM) in order to evaluate coating thickness uniformity and morphology.

In Figure 1 the representative micrographs of the samples cross-sections are presented. The coating thickness was estimated from SEM observations. As expected, the hot-dip galvanizing process provided a thicker coating (17.0 ±1.5 µm), than the ZnFe electrodeposited one (7.3±0.2 µm).
Reference: Not shown in this demonstration version.