Galvanized Sheet Metal Vs Aluminum

The question is frequently asked when two dissimilar metals are placed in contact with each other.

Galvanized sheet metal vs aluminum.

Galvanized steel has a porous and rough surface which is difficult to clean. Aluminium should last longer than galvanized steel. The chart below shows the electrode potentials of metals in seawater. However steel is generally cheaper per pound than aluminum see galvanized vs stainless for more info on steel.

Galvanized steel is expected to last about 15 to 20 years but aluminum should last over 20 years in the right environment cons aluminium is durable but it has a tendency to dent if hit by ladders tree limbs ice or hail. Cost and price are always an essential factor to consider when making any product. The aluminum is added to improve the adhesion between the coating and the steel substrate during formation. Both metals can be used for roofing.

Galvanized and galvalume steel roofing. However aluminum resists it slightly better than galvanized steel. There are many aluminum understructures with galvanized steel exteriors built over the past half century. Galvanized steel has better corrosion resistance.

The upper limit of the operating temperature of aluminum is 85 c. Aluminum is a silvery white soft nonmagnetic ductile metal. Aluminum is a metal whereas galvanized steel is obtained by a hot dipping process in which carbon steel is dipped into zinc. To help this blog will explain the gauge system and features a sheet metal gauge chart.

This is achieved through a multi step process where a steel sheet is immersed in pure molten zinc at a very high temperature bonding the zinc to the steel. What happens when i put galvanized steel together with aluminum parts or put aluminum sheets on galvanized steel studs. The price of steel and aluminum is continually fluctuating based on global supply and demand fuel costs and the price and availability of iron and bauxite ore. Aluminum is primarily used for architectural roofing.

Smacna s manual lists the pros and cons of a range of flashing materials including stainless steel copper lead aluminum and galvanized steel. At the same thickness steel is 2 5 3 0 times stronger. When working with sheet metal it is common for the term gauge to be used someone unfamiliar with the gauge system may not understand what is meant by 18 gauge steel for example. Stainless is considered 100 year compatible but is very expensive and relatively difficult to fabricate in the field.

Aluminum vs steel cost. Galvanized steel is essentially pure zinc with a very small percentage of aluminum. This is due in part to the fact that the steel is coated in a thin layer of zinc to prevent rusting. Steel has higher strength at high temperatures which is important in case of fire and aluminum dramatically reduces strength at t 200 c.