Abstract
In the case of coating directly a smooth aluminium plate with various photosensitive materials (for instance, photosensitive diazo compounds, photopolymer), it easily causes interfacial failure on the interfaces between aluminium surface and photosensitive layer during development and, reactions between bare metal and photosensitive material make development difficult.
In this studies, the author investigated the chemical oxidic conditions and their effects on formation of sub-layer which deactivates aluminium and assures good ahesion of the lightsensitive coating to the aluminium surface.
Picking up three treatment factors [factor A (4 level): concentration of triethanol amine, factor B (2 level): temperatures, factor C (5 level): immersion time.] among factors influencing on treatment conditions, the experiment was performed in all the combinations of those factors. The surface roughness (Ra: center line average height of treated films was taken up as the characteristic. The author investigated the relationship of those factors to the surface roughness by techniques of statistical analysis (three way layout).
As the results, we found that most effective factor on the surface roughness of chemical conversion coatings was temperature, and the higher temperature resulted the larger value of Ra.
