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A method of promoting bonding between steel alloys and organic films is accomplished by the selective etching of the alloy surface. The method is described in the following.
English (United States)
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Process to Enhance the Adhesion of a Polymer Film to a Steel Alloy
A method of promoting bonding between steel alloys and organic films is
accomplished by the selective etching of the alloy surface. The method is
described in the following.
Some examples of chemical etches which induce surface roughness and
compositional changes are: HCl/HNO3, H2SO4/oxalic acid and HCl/FeCl3 .
Surface analysis by means of X-ray photoelectron spectroscopy (XPS)
demonstrates that the described etches enhance the concentration of chromium
in the top 100 angstrom layer. Equally, high resolution XPS reveals that
chromium is present in an oxidized form on all of the etched surfaces.
Because chromium or chromium oxides can be used to improve bonding of
organic layers to metallic films, the preferential enrichment of chromium via the
above described chemical etches increases adhesion between an organic film
and the alloy surface.
Additional adhesion enhancement can be accomplished using, for example,
surface modifiers such as silanes which can produce anchoring points for
crosslinking of the surface-modified alloy to an organic layer. In synthesis, two
chemical coupling mechanisms are maximized at the alloy surface (chromium
and reactive group) to improve the adhesion of an organic film. However, the
type of reactive group selected will determine the final value of peel strength.