溶融亜鉛めっき vs. 陽極酸化: 道路標識ブラケットの防食基準
How galvanized sign brackets and anodized aluminum defend against road salt — compared across ASTM A123/A153 thickness grades, MIL-A-8625 types, salt-spray hours, and the certification records DOT compliance engineers need to verify before approving a bracket lot.
