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Galvanized steel-sheet without spangle, manufacturing method thereof and device used therefor.
Spangle-free, hot-dip galvanized steel sheet, and a method and device for manufacturing the same. The hot-dip galvanized steel sheet is characterized in that a solidified zinc crystal of hot-dip galvanized layer has an average crystalline texture particle diameter of 10 to 88, and there is no solidification traces of dendrites upon observing under a microscope at a magnification of 100X.; The hot-dip galvanized steel sheet comprises dipping a steel sheet in a bath of a zinc-coating solution containing 0.13 to 0.3% by weight of aluminum; air-wiping the steel sheet to remove an excess of the coating solution; spraying water or an aqueous solution on the air-wiped steel sheet, using a steel sheet temperature in the range of a hot-dip galvanization temperature to 419°C as a spray initiation temperature and using a steel sheet temperature in the range of 417 to 415°C as a spray completion temperature; passing sprayed liquid droplets of water or aqueous solution through a mesh-like high- voltage charged electrode which is electrically charged with a high voltage of -1 to -50 kV; and allowing the electrode-passed liquid droplets to be bound to the surface of the steel sheet and thereby being served as solidification nuclei of molten zinc.; The hot-dip galvanized steel sheet of the present invention exhibits superior corrosion resistance, blackening resistance, oil stain resistance, surface friction coefficient and surface appearance, and can be used for a variety of materials such as inner and outer plates of car body, household electric appliances and construction materials and steel sheet for painting.
Galvanized wire protected against corrosion by chromate passivation
Soln. used for chromating galvanized wire was found to greatly improve corrosion-resistance of galvanized wire. Packing is unnecessary.
Galvanizing & zinc coatings
Reviews hot dip processes such as Zincalume (galvalume) & Galfan and other aluminium alloys. Also discussed is galvanneal, silicon killed steel, electrogalvanising, painting and the general tenor is defending zinc as coating material from non-zinc competitors. 17 refs
Galvanizing - Environmental Factors
Zinc in the Environment - a review. Environment and regulation: the scene in the US.
Galvanizing - Towards the 21st Century
Hot dip galvanizing into the 21st century - the view from North America. Hot dip galvanizing into the 21st century - the view from Europe.
Galvanizing and Coating with Chromates. Effects of Galvanizing and Post-Treatment on Corrosion Behavior.
Apparatus for galvanizing linear element of Fe metal comprises upwardly open reservoir of molten Zn; means for providing enclosed space containing inert gas atmos.; annular nozzle, means for temp. control for molten Zn, for pre-heating linear element and driving it at velocity of 90-100 ft/min; means for flowing molten Zn upwardly from reservoir through nozzle; latter being configured to direct flow through inert gas atmos. in converging conical curtain toward linear element at below linear velocity of element to apply coating to it; and means for reducing coating temp. to solidify it after permitting coating to remain in liquid phase to form intermetallic alloy layer at interface between molten Zn and linear element.
Galvanizing apparatus with coreless induction furnace
Galvanizing bath apparatus.
A continuous hot-dip galvanizing line uses a coating pot containing a molten zinc bath having bottom dross and further comprises a pump. The pump agitates the bottom dross so the bottom dross interacts with aluminum and converts to top dross, which can be removed without needing to stop the galvanizing line. A reaction vessel may also be used to provide a higher concentration of aluminum to react with the bottom dross.
Galvanizing in Action - Performance
Atmospheric conditions and hot dip galvanizing performance. Hot-dip galvanized piping - the fight back to regain lost market share. The performance of galvanized steels in railway applications.
Galvanizing in Action - The Designers View
Glass hall for Neue Messe, Leipzig. Hot dip galvanized bridges for Japanese expressways.
Galvanizing in Action - Working with Paint
Experience of organic coatings on hot dip galvanizing in Japan. A revitalised interest in hot dip galvanizing for structural steelwork. The PepsiMax Big One roller coaster: Blackpool Pleasure Beach.
Galvanizing linear elements
Improved apparatus for continuous hot-dip galvanizing of linear elements in which source of zinc is under inert gas atmos. Stream of molten Zn flows from source through linear application zone, and linear element passes axially through this zone parallel to longitudinal axis such that each point of element is in contact with molten Zn. Means for causing stream of molten Zn to flow through application zone before substantial solidification facilitates galvanizing without auxiliary heat source to maintain Zn stream molten.
Galvanizing linear material
Fe linear material, e.g., tube, pipe or structural shapes, are galvanized as part of continuous manufacturing line, by passing axially travelling pre-heated element through transversely flowing molten zinc.
Galvanizing linear materials
Method comprises galvanizing linear Fe metal element by means of pump, by maintaining inert gas above surface of molten Zn in open reservoir in enclosed space; heating element to at least temp. of Zn and driving it through application zone above surface; pumping stream of molten Zn under pressure to 1 side of element adjacent application zone; projecting stream through zone around entire circumference of element in excess of quantity that will adhere, stream being short and rapid to avoid solidifying Zn due to cooling in inert atmos.; and allowing excess and unadhered Zn to fall onto molten Zn.