What is the main concern when using stainless steel in coastal regions?

The main concern when using stainless steel in coastal regions is its susceptibility to corrosion due to the high salinity and humidity present in these environments. Despite stainless steel's reputation for being resistant to corrosion compared to other metals, it can still suffer from chloride-induced pitting and crevice corrosion when exposed to seawater and salt-laden air. This phenomenon occurs because the chloride ions can break down the protective oxide layer that forms on stainless steel, leading to accelerated degradation.

Understanding this process is crucial for landscape architects and designers when selecting materials for coastal projects. They may need to opt for marine-grade stainless steel, which contains higher levels of alloying elements like molybdenum, to enhance corrosion resistance and ensure longevity.

The other options presented do not accurately capture the primary concern for stainless steel in such environments. The weight of stainless steel is not typically a significant issue in construction; its structural capabilities are well established for various applications, and it offers a broad range of aesthetic options.