Лако-красочные материалы — производство

This is the second most important type of phosphate anticorrosive pigment. Passivation is normally accomplished through the ability of triphosphate ions to chelate iron ions. Additional passivation is through phosphate ions produced by de-polymerization of triphos­phate ions. These pigments are also modified with silicates to con­trol their solubility.

Phosphate pigments are widely explored as anticorrosive replace­ments for toxic lead and chromate-based pigments. Being white, they are more versatile than chromates. This large group of pig­ments may be classified in the following two subgroups. Zinc-based phosphates: examples include zinc phosphate, alumi­num zinc phosphate, zinc molybdenum phosphate, aluminum-zinc hydroxyphosphate, zinc hydroxymolybdate phosphate, basic zinc phosphate, […]

This is mainly used to manufacture wash primers based on poly(vinyl butyral) resin, which is popularly used on aluminum or galvanized iron. Their main purpose is passivating the surface and improving adhesion of subsequent coatings. They are applied at very low solids to give a very thin film. Due to toxicity of hexavalent chromium, these […]

This pigment contributes to anticorrosive properties through chro­mate ions as well as by a neutralizing effect through zinc ions. Because of their yellow color, they are generally limited to use as primers. As they are versatile and highly efficient, zinc chromates are effective inhibitors even at relatively low pigment levels. As a result, they used […]

Chromate pigments have been used for long time as corrosion inhibi- tive pigments. The anticorrosive action of chromates is derived from the presence of a certain amount of water-soluble chromates. Soluble chromate ions are inhibitive, and chromate passivating ions are among the most efficient passivators known. They are effective both in catho­dic and anodic areas. […]

Pigment Red 105; formula: Pb3O4 Red lead pigments are one of the oldest and most popular types of anticorrosive pigments, mainly used for primers for metals. They are indirect inhibitors and require reaction with a selected resin system. When used in linseed oil or other oleoresinous binders, they react with acidic groups in the resin […]

Apart from optical properties such as color and hiding, certain pig­ments are used in protective coatings to increase their corrosion resistance properties. The anticorrosive pigments used in conjunc­tion with suitable binder in protective coatings systems play a major role in protection of metals from corrosion. Based on their mode of action to prevent corrosion, anticorrosive […]

Pigment Metal 2; formula: xCu-yZn These pigments are platelet particles of copper-based alloys, frequently referred to as bronze pigments, even though brass (a copper-zinc alloy) is typically used. The composition ranges from pure copper flake (100 % Cu) to brass with 30 % zinc content. Depending upon composition, the color ranges from coppery red through […]

Pigment Metal 6; formula: Zn These are the second most important metallic pigments used in coating industry. They are supplied as fine gray powders with primarily sphe­rical particles. Typical characteristics of these pigments include a very low oil absorption value, high density (~7 g/ml), and high UV absorp­tion. They are mainly used in anticorrosive coatings […]

Fine particles of malleable metals in elemental form are also used as pigments in coatings for aesthetic as well as protective purposes. They are generally platelet-shaped particles, but some are spherical. 3.3.5.1 Aluminum pigments Pigment Metal 1; formula: Al Aluminum pigments are the most often used metallic pigment in surface coatings. They are prepared from […]