Why galvanized iron is used as a building material

It acts as a sacrificial anode, which is the main component of a galvanic cathodic protection CP system used to protect buried or submerged metal from corrosion. This means that if the coating is scratched, the exposed steel or iron will be protected by the remaining zinc. The zinc protects its base metal by corroding before iron. These electro-galvanized nuts and bolts go into light mechanical products, like cars and bicycles. Piping: Galvanized piping replaced cast iron and lead in cold-water plumbing in the early 20th century.

To increase the longevity, some galvanized piping were lined with epoxy resin, which is a petroleum-derived material known for its excellent adhesion, chemical and heat resistance, and insulation properties. After World War II, galvanized pipes were replaced by copper and plastic piping for interior water drinking service in homes, schools, and similar locations.

Transportation: Cars and aircrafts are large consumers of galvanized steel, as the industries use it for: Hoods Fenders Oil pans Parking brakes Roofing Seating Spring housing Wire rope: Because wire rope is a highly stressed product, the hot-dip coating process can reduce the strength of the steel on a measurable scale due to hydrogen embrittlement.

Unlike organic coatings, small damaged areas need no touch up. Complete protection. Every part of a galvanized article is protected, even recesses, sharp corners and inaccessible areas. No coating applied to a structure or fabrication after completion can provide the same protection. Ease of inspection. Galvanized coatings are assessed readily by eye, and simple non-destructive thickness testing methods can be used. The galvanizing process is such that if coatings appear sound and continuous, they are sound and continuous.

Faster erection time. This standard includes general information on the characteristics and common uses of galvanized iron and steel and identifies typical problems associated with these materials along with common causes of its deterioration. Galvanizing is a process of coating iron or steel with zinc in order to provide greater protection against corrosion for the iron or steel base.

The process of galvanizing sheet iron was developed simultaneously in France and England in Both of these methods employed a "hot dipping" process to coat sheet iron with zinc. Like tinplate, early galvanized metals were hand dipped. Today almost all galvanized iron and steel is electroplated. The following are the most common methods for applying protective coatings of zinc to iron and steel:.

The placing of a thoroughly cleaned iron or steel element in an air-free enclosure where it is surrounded by metallic zinc dust. The architectural element is then heated and a thin, zinc alloy coating is produced. The application of a fine spray of molten zinc to a clean iron or steel element.

The coating can then be heated and fused with the surface of the iron or steel to produce an alloy. Although there is some overlap between the two categories, the inherent material deterioration problems generally occur gradually over long periods of time, at predictable rates and require appropriate routine or preventive maintenance to control. Please try again later. No results could be found for the location you've entered. Rates for Alaska, Hawaii, U.

Territories and Possessions are set by the Department of Defense. Rates for foreign countries are set by the State Department. The End Date of your trip can not occur before the Start Date. Traveler reimbursement is based on the location of the work activities and not the accommodations, unless lodging is not available at the work activity, then the agency may authorize the rate where lodging is obtained.

Unless otherwise specified, the per diem locality is defined as "all locations within, or entirely surrounded by, the corporate limits of the key city, including independent entities located within those boundaries. Per diem localities with county definitions shall include "all locations within, or entirely surrounded by, the corporate limits of the key city as well as the boundaries of the listed counties, including independent entities located within the boundaries of the key city and the listed counties unless otherwise listed separately.

Introduction Galvanizing is a process of coating iron or steel with zinc in order to provide greater protection against corrosion for the iron or steel base. The following are the most common methods for applying protective coatings of zinc to iron and steel: Hot-dip Galvanizing: The immersion of iron or steel in molten zinc, after the surface of the base metal has been properly cleaned. This process gives a relatively thick coating of zinc that freezes into a crystalline surface pattern known as spangles.

During the process, a multiple layered structure of iron- or steel-zinc alloys is formed between the inner surface of the zinc coating and the iron or steel. These middle layers tend to be hard and brittle and may peel or flake if the iron or steel element is bent. Electrogalvanizing: The immersion of iron or steel in an electrolyte, a solution of zinc sulfate or cyanide.