Abstract: There is disclosed a water-reducible, chrome-free coating composition for providing corrosion protection to a substrate, such as a metal substrate. The deposited coating film is corrosion-resistant and, for coated articles which are threaded, e.g., steel fasteners, the coating provides a non-thread-filling coating. The coating composition contains particulate metal, such as particulate zinc or aluminum. Although substituents can be separately packaged, the composition is virtually always a one-package coating composition. The composition is water-based, while also containing low-boiling organic liquid. The composition also contains water-reducible organofunctional silane, particularly an epoxy functional silane, as a binding agent. The composition has highly desirable, extended shelf life. The composition can be easily applied in usual manner, such as dip-drain or dip-spin technique, and readily cures at elevated temperature.

Abstract: There is disclosed a water-reducible, chromium-free coating composition for providing corrosion protection to a substrate, such as a metal substrate. The deposited coating film is corrosion-resistant and for coated articles which are threaded, e.g., steel fasteners, the coating provides a non-thread-filling coating. The coating composition contains particulate metal, such as particulate zinc or aluminum. Although substituents can be separately packaged, the composition is virtually always a one-package coating composition. The composition contains water-reducible organofunctional silane, particularly an epoxy functional silane, as a binding agent. The composition has highly desirable, extended shelf life. The composition can be easily applied in the usual manner, such as dip-drain or dip-spin technique, and readily cures at elevated temperature.

Abstract: A coating composite provides extended corrosion resistance for substrate metals. The thin metallic undercoat of the composite contains combined metals. The heat curable and substantially resin free topcoat is established from composition containing chromium in non-elemental form, which topcoat composition may further contain particulate metal, all in liquid medium. In addition to outstanding corrosion resistance, the composite can retain substrate weldability as well as achieving formability, while further enhancing paintability and weatherability.

Abstract: A coating composite provides extended corrosion resistance for substrate metals. The thin metallic undercoat of the composite contains combined metals. The heat curable and substantially resin free topcoat is established from composition containing chromium in non-elemental form, which topcoat composition may further contain particulate metal, all in liquid medium. In addition to outstanding corrosion resistance, the composite can retain substrate weldability and formability, while further enhancing paintability and weatherability.

Abstract: Aqueous solutions of xanthan gum hydrophilic colloid, that would otherwise support microbial growth, are preserved with chromic acid. The solutions should be at a pH above 3, and contain minimal amounts of reduced forms of chromium, if any, so that they will be storage stable not only against microbial growth, but also against gel formation.

Abstract: Metal treating compositions, containing chromic acid and pulverulent zinc, and which find particular utility in the coating of metal substrates prior to painting, now exhibit extended bath stability through pH adjustment. The key to the adjustment is not in the final bath makeup. Rather, the adjustment is made during preparation of a precursor component containing chromic acid. Such component of adjusted pH may then be blended with additional composition ingredients including the pulverulent zinc to form a bath of excellent stability, e.g., extended freedom from gelation.

Abstract: Metal treating compositions, formulated from precursor components, and containing chromic acid with pulverulent zinc and thereby finding particular utility in coating metal substrates prior to painting, can now have simplified precursor components. Such simplified precursor components may be easily and readily blended to form the metal treating composition. Yet such precursor components exhibit enhanced storage stability as well as compositional simplicity.

Abstract: Metal treating compositions, containing hexavalent-chromium-providing substance and pulverulent zinc, and which find particular utility in the coating of metal substrates prior to painting, now exhibit extended bath stability through pH control. The key to the control is achieved during preparation of precursor components. Such components of controlled, or adjusted, pH are then blended together to form a bath of excellent stability e.g., extended freedom from gelation.