Лако-красочные материалы — производство

It was mentioned in Section 5.2.5.3, that special synergistic effects in the field of anticorrosives could be observed when using inorganic anticorrosive pigments in combination with organic corrosion inhibitors. Following this theoretical and in practice proven knowledge, there are pigments on the market referred to as syner­gistic hybrid pigment grade corrosion inhibitors. For example in US 6,139,610, a corrosion-inhibiting pigment is described based on a stable unitary hybrid which contains organic and inorganic solid phase constituents [5.97]. The inorganic phase includes a cation selected from Zn, Mg, Ca, Sr, Ti, Zr, Ce, Fe and as anion a phos­phate, polyphosphate, phosphite, molybdate or silicate [5.97]. The organic phase may include zinc or alkyl-ammonium salts of organic mercapto — and thio-compounds or their derivates [5.97].

As a second example of inorganic organic hybrid pigments, anticorrosives based on oxyaminophosphate salts of magnesium or magnesium and calcium should be mentioned. It is reported, that these pigments, when used in protective coatings, build a layer of magnesium oxide on the metal substrate. In the case of steel this layer is said to be a passive layer, and in the case of aluminum to be a barrier layer [5.98].

Many of the phenomena involved in the inhibition of corrosion provided by means of the application of protective coatings using new inorganic anticorrosive pigments in combination with organic corrosion inhibitors or so-called inorganic organic hybrid pigments have still not been fully explained [5.51].

However, when looking at the recent developments in the field of modified inor­ganic anticorrosive pigments (see previous Sections) and inorganic organic hybrid pigments, it becomes obvious that one of the main driving forces within this devel­opment process has been the possibility to take advantage of synergistic properties [5.54].

The terms synergy or synergism are defined as a “property by which two or more agents act together more effectively than either does alone. A phenomenon, where the mixed effect of two influences is greater than the sum of the two influences acting separately, i. e., the unexpected interaction of parts in combination” [5.99].

5.2.12