Does snow corrode zinc – aluminum – magnesium coated steel?

The initial corrosion behavior of zinc – aluminum – magnesium coated steel (ZAM) and galvanized steel (GI) in regions of extremely cold (Mohe) and industrial climates (Shenyang) was investigated. Thick snow and dense corrosion products, by preventing the intrusion of corrosive particles, inhibited the corrosion of Mohe+ (upward).

What is zinc-aluminum-magnesium coated steel (Zam)?

Hence, zinc–aluminum–magnesium coated steel (ZAM), which is obtained by adding Al and Mg on GI, is widely applied in automobile, photovoltaic power generation, and construction fields [ , , , , , , ].

What is zinc aluminum magnesium steel?

The Zinc Aluminum Magnesium steel is composed of a dense alloy coating. It is the most precise and best coating material. Under the same coating, the service life of Zinc Aluminum Magnesium steel is 10-20 times that of galvanizing steel.

Where are the corrosion pits found in zinc – aluminum – magnesium coated steel?

The sharp and the cylindrical corrosion pits were found in ZAM and GI, respectively. The initial corrosion behavior of zinc – aluminum – magnesium coated steel (ZAM) and galvanized steel (GI) in regions of extremely cold (Mohe) and industrial climates (Shenyang) was investigated.

How does the primary Zn phase affect the expansion of corrosion pits?

The massive primary Zn phase also restricted the expansion of the corrosion pit, in which case a localized area of higher susceptibility (coarse eutectic phase nearing the primary Zn phase) would promote sharp corrosion pits. However, the grain boundaries were even and dense in GI, which favored horizontal and vertical corrosion pit expansion.

What are the initial corrosion products of Zam in sulfur-containing atmospheres?

The initial corrosion products of ZAM in sulfur-containing atmospheres are magnesium-containing sulfites and sulfates with high solubility [ 28 ]: (2)Mg→Mg2++2e− (3)2SO2+O2+2H2O→2SO42−+4H+ (4)Mg2++SO42−→MgSO4