2 edition of Specification for zinc coatings on iron and steel articles found in the catalog.
Specification for zinc coatings on iron and steel articles
British Standards Institution.
|Statement||British Standards Institution. Part2, Sherardized coatings.|
|The Physical Object|
One option to extend the life expectancy of existing galvanized piping is to line it with an epoxy resin. Scope 1. The number of coats to be applied and the interval between coats. Note 1 — In case of triple spot test, the average mass of zinc coating as obtained from three test samples shall be reported. This requires about 15 to 30 seconds except in the case of sherardized coatings which require somewhat longer time.
Volumetric method has been included for determining the mass of zinc coating on steel wire as this method givrs reasonably accurate results for routine testing. No other units of measurement are included in this standard. It is a preferred method for coating small, complex-shaped metals, and for smoothing rough surfaces on items formed with sintered metal. Inch-pound units and SI units are not necessarily exact equivalents. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
In many instances, steelwork will be in a warm dry interior where it will not corrode, and the structural stability of the building will not be threatened during its design life generally taken as 50 years. The use of galvanized pipes lends some truth to the urban myth that water purity in outdoor water faucets is lower, but the actual impurities iron, zinc, calcium are harmless. More frequent re-coating may often be preferred for decorative reasons because of fading, contamination, wear and tear, etc. Where each coat is to be applied i. Electrodeposited zinc-coated steel wires or sheets are not covered here.
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It is not applicable to zinc coatings applied: To sheet, strip or wire in the non-fabricated form To close-coiled springs For purposes other than protective or decorative.
Galvanizing protects the underlying iron or steel in the following main ways: The zinc coating, when intact, prevents corrosive substances from reaching the underlying steel or iron. SCOPE 1. The coatings shall be provided in four standard thickness classes in the as-plated condition or with one of three types of supplementary finishes.
Selection of Zinc Coatings Once the decision is made to use a zinc coating for corrosion protection, a few additional factors must be considered to ensure the proper coating is selected for the application and service environment.
Scope 1. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. New Oelh. The users of Specification B are encouraged to review this specification in its entirety including the appendices, and access the supplementary papers, other standards, and published literature referenced herein and within other related references.
Marine and salty environments also lower the lifetime of galvanized iron because the high electrical conductivity of sea water increases the rate of corrosionprimarily through converting the solid zinc to soluble zinc chloride which simply washes away.
In modern usage, the term "galvanizing" has largely come to be associated with zinc coatings, to the exclusion of other metals. Chromate conversion coatings and other supplementary treatments enhance the corrosion resistance of electrodeposited zinc coatings and are commonly applied after electroplating.
When the evolution of hydrogen ceases or a few bubbles are being evolved, the test pieces shall be taken out, washed in water, wiped off well with IS i clean soft cotton cloth, fully dried and weighed again.
ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. In developed countries most larger cities have several galvanizing factories, and many items of steel manufacture are galvanized for protection. In the case of stranded or armoured wire, or wire which has undergone any other similar process, rare should be taken to avoid damage in preparing the sample.
Some zinc coatings will be eliminated by the nature alone, zinc coating processes limited to small parts or sheet steels cannot be considered for the protective coating of structural steel members ; others may be ruled out based on cost, appearance, availability, etc.
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Coating Weight The service life of zinc coatings is a linear function of the zinc coating thickness.
Since World War II, copper and plastic piping have replaced galvanized piping for interior drinking water service, but galvanized steel pipes are still used in outdoor applications requiring steel's superior mechanical strength.
The wet and dry film thickness for each coat. Despite the superseding of his experimental results, it was Galvani's name rather than Volta's which became associated with the field. The use of galvanized pipes lends some truth to the urban myth that water purity in outdoor water faucets is lower, but the actual impurities iron, zinc, calcium are harmless.
The appearance of these substitutes may be different from those produced with hexavalent chromium.
These corrosion products, collectively known as the zinc patina, act as an additional barrier between the steel and the environment. Electrodeposited zinc-coated steel wires or sheets are not covered here.
A number of different methods of applying zinc coatings to steel are commercially available, each of which has unique characteristics. The life expectancy of galvanized piping is about 70 years,[ citation needed ] but it may vary by region due to impurities in the water supply and the proximity of electrical grids for which interior piping acts as a pathway the flow of electricity can accelerate chemical corrosion.between steel and the environment, zinc also has the ability to cathodically protect the base metal.
Zinc, which is anodic to iron and steel, will preferentially corrode and protect the iron or steel against rusting when the coating is damaged (see Figure 1, below).
Many diﬀ erent types of zinc coatings are commercially available. Standard Specification for. Zinc-Coated (Galvanized) Carbon Steel Wire Iron and Steel Articles with Zinc or Zinc-Alloy Coatings A Practices for Packaging, Marking, and Loading For Annual Book of ASTM Standards volume infonnation, refer to the standard's Document Summary page on.
zinc or zinc-iron alloy coating. This same hot-dip immersion process is also used to produce other coatings such as zinc-aluminum alloys.
Reason for galvanizing Steel rusts (oxidizes/corrodes) when left unprotected in almost any environment. Applying a thin coating of zinc to steel is an effective and economical way to protect it.
ASTM-A - Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware; ASTM-A - Standard Practice for Locating the Thinnest Spot in a Zinc (Galvanized) Coating on Iron or Steel Articles, ASTM-A - Standard Specification for Steel Sheet, Terne (Lead-Tin Alloy) Coated by the Hot-Dip Process (Withdrawn ).
Standard Practice for Locating the Thinnest Spot in a Zinc (Galvanized) Coating on Iron or Steel Articles, ASTM A/AM: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications: ASTM A/AM: Standard Specification for High-Strength Low-Alloy.
[ASTM-B] This specification covers requirements for electrodeposited zinc coatings applied to iron or steel articles to protect them from corrosion.
It does not cover zinc-coated wire or sheets. High strength steels (tensile strength greater than MPa) shall not be electroplated.