Corrosion resistant structure
A corrosion resistant structure is provided. The corrosion resistant structure includes a steel layer, a metal layer, and an organic layer. The metal layer contains zinc, aluminum, or a combination thereof. The metal layer is disposed on the steel layer. The metal layer is in contact with the steel layer. The metal layer and the steel layer have different compositions. The organic layer is disposed on the metal layer. The organic layer is in contact with the metal layer. The organic layer includes an organic resin, a diol compound containing two aliphatic rings, and an alkaline earth metal salt or an alkaline earth metal aluminum phosphate.
1 . A corrosion resistant structure, comprising:
a steel layer;
a metal layer containing zinc, aluminum, or a combination thereof disposed on the steel layer and in contact with the steel layer, and the metal layer and the steel layer have different compositions; and
an organic layer disposed on the metal layer and in contact with the metal layer, wherein the organic layer includes an organic resin, a diol compound containing two aliphatic rings, and an alkaline earth metal salt or the alkaline earth metal aluminum phosphate.
2 . The corrosion resistant structure as claimed in claim 1 , wherein the diol compound containing two aliphatic rings has a chemical structure of
wherein each R 1 is independently H or C 1-3 alkyl group, and each of m and n is independently an integral of 1 to 10.
3 . The corrosion resistant structure as claimed in claim 1 , wherein the organic resin comprises polyacrylic acid, polyurethane resin, polyester resin, epoxy resin, or a combination thereof.
4 . The corrosion resistant structure as claimed in claim 1 , wherein the alkaline earth metal salt comprises strontium phosphate, magnesium phosphate, calcium phosphate, calcium magnesium phosphate, magnesium nitrate, calcium nitrate, or strontium nitrate.
5 . The corrosion resistant structure as claimed in claim 1 , wherein the organic resin and the diol compound containing two aliphatic rings have a weight ratio of 1:0.16 to 1:1.
6 . The corrosion resistant structure as claimed in claim 1 , wherein the organic resin and the alkaline earth metal salt or the alkaline earth metal aluminum phosphate have a weight ratio of 1:0.21 to 1:1.28.
7 . The corrosion resistant structure as claimed in claim 1 , wherein the organic layer has a thickness of 30 micrometers to 100 micrometers.
8 . The corrosion resistant structure as claimed in claim 1 , wherein the steel layer comprises cold-rolled steel, hot-rolled steel, or carbon steel.
9 . The corrosion resistant structure as claimed in claim 1 , wherein the metal layer comprises zinc metal, aluminum metal, aluminum zinc alloy, magnesium aluminum zinc alloy, or magnesium aluminum zinc nickel alloy.
10 . The corrosion resistant structure as claimed in claim 1 , wherein the metal layer has a thickness of 5 micrometers to 100 micrometers.
11 . The corrosion resistant structure as claimed in claim 1 , wherein the alkaline earth metal aluminum phosphate includes strontium aluminum phosphate or calcium aluminum phosphate.