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Zinc calcium phosphate conversion coatings

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A newly developed pretreatment system, superior to conventional zinc phosphating in terms of the resultant mechanical and anticorrosive properties, is described. It produces fine crystalline coatings suitable for automotive parts, agricultural machinery etc.

Zinc chloride plating bath

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Zn plating bath having pH >4 and containing >1 mole/l Zn2+ and >1 polymeric polyethylene glycol R1-O-(CH2-CH2-O)(n)-R2 (n >13) and/or concn of polymer is adapted to incorporation of org. compound in coating >0.1% (as C). Bath can be used at high c.d. and coating has levelling effect on steel and high corrosion resistance.

Zinc chromate conversion coatings

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Survey of types of Zn chromate passivation coatings includes notes on Philips 'No-dump' chromating process using 2 alternative solns. (1) sulphate based - 7 g/l CrO3 and chloride based - 3 g/l CrO3 with minimum Cr(VI) concns. in rinse water. Automatic control of process is described.

Zinc chromium alloy plated steel

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Bath contains Zn(II) and trivalent chromium in bath with up to 20 gm/l of additive which is polyethyleneoxyphenol deriv. having at least 1 sulphonic acid group, 1 sulphate group, 1 amino group, carboxyl group, nitro group or halogen as benzene ring substituent which is added to accelerate codep'n of Cr and improve bath stability.

Zinc Chromium Alloy Plated Steel Sheet

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Title Zn-Cr plated sheet with excellent adhesion uses acid bath with total Zn + Cr = 0.5M at pH 1.0 to 4.0, 25°C to 70°C, 50 to 200 Amp/sq. dm and at least 1 nonionic organic additive having a triple bond.

Zinc Chromium Alloy Plated Steel Strip with Good Adhesion

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Zinc Chromium Plated Steel Strip with Additional Layer

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Zinc coated abrasive for surface preparation of steel lengthens rust-free period

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Use of Zn coated abrasive for blasting steel surfaces which are to be painted is described. Ferrous silicate mineral slag is encapsulated in epoxy resin and coated with fine Zn dust. Accelerated laboratory corrosion tests show that time to re-rust is extended greatly by coated abrasive blasting, even in relatively severe environments.

Zinc coated steel markets in the building industry

Relevancy:  

Focus on growing architectural use of steel in smaller & domestic buildings & potential market opportunities for components which are hot dip galvanised. Note on "UltraSteel" developed & patented by Hadley Industries plc in UK which has dimpled surface.

Zinc coated steel sheet

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Electrogalvanised or hot dip coated zinc sheet with improved formability & weldability, having zinc oxide layer over zinc.

Zinc coated steel sheet

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Electrogalvanised sheet or strip with improved formability & weldability has chemically applied buffered alkaline sol'n pH 7. 8 to 8.4 such that zinc oxide layer of at least 0.340 gm/sq. metre is formed.

Zinc coated steel sheet & strip

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Galvanised steel with improved formability having Zn oxalate coating bonded to at least 1 side, at up to 200 mg/sq. ft.

Zinc coated steel sheet and strip

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Zn coated steel sheet or strip with improved formability comprises Zn oxalate film bonded to Zn coating (10-200 mg/sq.ft.

Zinc Coated Wire Performance in Representative Agricultural Sites in South Africa

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The fencing of land contributes significantly to the expenses of farmers in South Africa, who purchase about 240,000t/y wire. It is therefore in the interest of consumers to ensure they obtain the most durable wire for the application intended. The effect of environmental conditions on the longevity of wire is a factor that should be borne in mind. In order to advise clients, especially the forming community, on the suitability of wire fencing in areas with differing climates, the Agricultural Engineering Institute of South Africa (AEI) initiated, in December 1990, a long-term atmospheric exposure programme. The projects objective was to determine the effect of environmental corrosion on five different types of wire that were available at the time in six different localities in South Africa. Various types of steel wire were used: lightly galvanized, heavily galvanized, aluminium coated and zinc/aluminium coated (Zn 95%/Al 5%, Galfan). A locally produced rust-resistant steel wire, with nominally 11 per cent chromium, was also included. The projects compared the performance of wires after an 11-year period. Wire coating thickness, and in the case of the rust-resisting steel, its tensile strength, were compared with the initial measurements made in 1990. The results are reported. The marine site was significantly more corrosive on galvanized wire coatings than the inland sites. The Galfan coating was deemed the optimum solution. Tables report results, metallographs show attack. 5 refs

Zinc coating a ferrous substrate

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Galvanizing method comprising introducing Fe substrate to coating chamber with inert atmos.; electrostatically depositing layer of Zn powder; liquefying Zn powder on substrate; reflowing liquid Zn to create Zn-Fe interface; and cooling below liquidus temp. of Zn inert atmos.