<P> Thermal diffusion galvanizing, or Sherardizing, provides a zinc diffusion coating on iron - or copper - based materials . Parts and zinc powder are tumbled in a sealed rotating drum . Around 300 ° C (572 ° F), zinc will diffuse into the substrate to form a zinc alloy . The advance surface preparation of the goods can be carried out by shot blasting . The process is also known as "dry galvanizing", because no liquids are involved; this can avoid possible problems caused by hydrogen embrittlement . The dull - grey crystal structure of the zinc diffusion coating has a good adhesion to paint, powder coatings, or rubber . It is a preferred method for coating small, complex - shaped metals, and for smoothing rough surfaces on items formed with sintered metal . </P> <P> Although galvanizing will inhibit attack of the underlying steel, rusting will be inevitable after some decades of exposure to weather, especially if exposed to acidic conditions . For example, corrugated iron sheet roofing will start to degrade within a few years despite the protective action of the zinc coating . Marine and salty environments also lower the lifetime of galvanized iron because the high electrical conductivity of sea water increases the rate of corrosion, primarily through converting the solid zinc to soluble zinc chloride which simply washes away . Galvanized car frames exemplify this; they corrode much faster in cold environments due to road salt, though they will last longer than unprotected steel . </P> <P> Galvanized steel can last for many decades if other supplementary measures are maintained, such as paint coatings and additional sacrificial anodes . The rate of corrosion in non-salty environments is caused mainly by levels of sulfur dioxide in the air . In the most benign natural environments, such as inland low population areas, galvanized steel can last without rust for over 100 years . </P> <P> This is the most common use for galvanized metal, and hundreds of thousands of tons of steel products are galvanized annually worldwide . In developed countries most larger cities have several galvanizing factories, and many items of steel manufacture are galvanized for protection . Typically these include: street furniture, building frameworks, balconies, verandahs, staircases, ladders, walkways, and more . SGCC hot dip galvanized steel is also used for making steel frames as a basic construction material for steel frame buildings . </P>

What do you mean by galvanization also write its application in daily life