Aluminum alloys and coated aluminum alloys with high corrosion resistance and methods of making the same

An aluminum alloy, comprising:

• from 0.01 wt. % to 5.0 wt. % Mg;
• from 0.01 wt. % to 8.0 wt. % Zn;
• up to 5.0 wt. % Si;
• up to 1.0 wt. % Fe;
• up to 0.25 wt. % impurities;
• and
• Al;
• wherein the Mg and Zn are present in a ratio of from 100:1 to 10:1 of Mg to Zn by weight;
• wherein the aluminum alloy has a coverage percent of 18% or less during filiform corrosion testing according to ISO 4623-2(2016).

A coated aluminum alloy product, comprising:

• an aluminum alloy substrate, a coating on a surface of the aluminum alloy substrate, the coating comprising:
• from 0.3 at. % to 8.0 at. % Mg, Ca, Zn, Ni, or combinations thereof in an amount sufficient to prevent corrosion in the aluminum alloy substrate;
• wherein the coated aluminum alloy product has a coverage percent of 18% or less during filiform corrosion testing according to ISO 4623-2(2016);
• and wherein the coating on the surface of the aluminum alloy substrate is applied using a chemical wash, physical vapor deposition (“PVD”), or chemical vapor deposition (“CVD”).

A clad aluminum alloy product, comprising:

• a core layer having a first side and a second side;
• and
• a first clad layer in contact with the first side of the core layer, wherein the first clad layer comprises from 0.01 wt. % to 2.0 wt. % Zn, from 0.1 wt. % to 1.0 wt. % of Ca, from 0.1 wt. % to 1.0 wt. % of Mg, from 0.01 wt. % to 0.25 wt. % of Si, and Al;
• wherein the clad aluminum alloy product has a coverage percent of 18% or less during filiform corrosion testing according to ISO 4623-2(2016).