Coating compositions

Acetonitrile also is used as a catalyst and as an ingredient in transition-metal complex catalysts (35,36). There are many uses for it in the photographic industry and for the extraction and refining of copper and by-product ammonium sulfate (37—39). It also is used for dyeing textiles and in coating compositions (40,41). It is an effective stabilizer for chlorinated solvents, particularly in the presence of aluminum, and it has some appflcation in... 

The coating composition is a combination of hydrated chromium and aluminum oxides and hydroxides, eg, Cr202 XH2O, x — 1, 2. 

A typical coating composition for the CF component is shown in Table 12. It is dried in a high velocity air oven at 93°C. 

These pigments are sensitive to heat and bleed ia most paint solvents. They are, however, resistant to acids and bases. Their tinctorial strength is considerably greater than that of inorganic yellows but they are weaker than the diaryUde yellows. They are used extensively ia emulsion paints, paper coating compositions, inks (qv), and, depending on particle size, can ia some cases be used outdoors because of excellent lightfastness ia full shades. 

The relative reactivity of thermosetting powders can be easily deterrnined by the gel time or stroke-cure test. A small amount of powder is placed on a hot plate, usually at 200°C, and the time until the coating composition gels, or no longer forms fibers, is deterrnined. Powders are characterized by relative gel times (cure rate) as shown in Figure 1. 

The film properties required for some appHcation can only be deterrnined by the performance of the appHed coating in practice. Because requirements and exposure conditions vary widely, devising laboratory tests to predict film performance is difficult and frequendy not possible. Data banks of actual field performance as functions of coating compositions, appHcation variables, and environmental factors can be very usehil. 

Enamel firing temperature is dictated by the coating composition, metal thickness, and the type of metal used. Enamels for aluminum are fired at... 

Table 4-15 lists base materials Elliott has tested. This list, which is continually being expanded, includes low alloy steels, high alloy iron base, nickel base, cobalt base materials, and odiers. Table 4-16 shows some of the coatings Elliott has tested. The list indicates die supplier, coating designation, and major components of the coating composition. 

The coating composition is iridium-rich to favour oxygen rather than chlorine evolution, and to assist in reducing the formation of acidic conditions at the anode-concrete interface. 

The effect of coating, composition and of substrate structure on the oxidation rate is shown in Fig. 12.25 which gives weight-increase/time curves for oxidation in air at 950°C of three steels of different carbon contents. 

Solids (Total Solids) the non-volatile matter in a coating composition, i.e. the ingredients of a coating composition which, after drying, are left behind and constitute the dry film. 

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