How does aluminum’s resistance to stress corrosion cracking compare to stainless steel in outdoor tree boxes?
When selecting materials for outdoor tree boxes, understanding their resistance to stress corrosion cracking (SCC) is crucial. Aluminum generally exhibits lower resistance to SCC compared to stainless steel, especially in environments with high chloride exposure, such as coastal areas. Stainless steel, particularly grades like 316 with added molybdenum, offers superior resistance due to its passive oxide layer. However, aluminum can still perform well in milder conditions and is lighter, making it easier to handle. Proper surface treatments or coatings can further enhance aluminum's durability. For long-term outdoor use in harsh environments, stainless steel is often the preferred choice.
