HIDE 316L Stainless Steel – Factsheet Understanding Surface Discolouration and Corrosion Resistance
What Is 316L Stainless Steel?
HIDE Covers are made from 316L stainless steel, also known as marine-grade stainless. This alloy contains chromium, nickel, and molybdenum, providing exceptional corrosion resistance, even in high-chloride or coastal environments. The low-carbon 'L' variant further enhances resistance at welds and edges, making it ideal for long-term outdoor use.
Does 316L Stainless Steel Rust?
Stainless steel does not rust in the same way as ordinary steel. It naturally forms a thin, invisible chromium oxide layer that protects against corrosion. Under certain conditions, however, surface staining or 'tea staining' can appear. This is cosmetic only and does not affect the structural integrity of the cover.
What Causes Discolouration?
• Exposure to salt, chlorine, or acidic cleaners can affect the passive protective film.
• Deposits of iron particles, dust, or other metals can cause minor surface staining.
• Improper cleaning or contact with steel tools may leave residue that discolours over time.
• ‘Tea staining’ is a cosmetic brownish tint that can occur in humid or coastal environments.
Stainless Steel Discolouration Develops Gradually
• Stainless steel does not discolour overnight — it occurs gradually from environmental exposure.
• Light surface discolouration can be easily removed if cleaned when first noticed.
• Ignoring discolouration for months allows buildup and makes removal more difficult.
• Any surface staining is cosmetic and easily managed through regular maintenance.
Maintenance & Prevention Tips
• Rinse stainless surfaces regularly with fresh water, especially in coastal environments.
• Use non-chloride, non-acidic stainless steel cleaners only.
• Avoid contact with mild steel tools, wire brushes, or grinding dust.
• Regular maintenance preserves the protective chromium oxide film and appearance.
* Read the Care & Maintenance Documentation
Stainless Steel is used extensively
316L stainless steel is the material of choice for multi-million-dollar superyachts, marine
architecture, and luxury hardware — chosen precisely because it performs exceptionally in harsh
conditions. Even superyachts require regular washing and maintenance to keep stainless fittings
and fixtures looking pristine. The same principle applies to HIDE Covers installed outdoors.
Key Facts
• 316L stainless steel provides outstanding corrosion and seawater resistance.
• Surface staining is generally cosmetic and easily removed when addressed early.
• Neglecting maintenance allows contaminants to accumulate and cause visible staining.
• Regular cleaning ensures long-term performance and visual appeal.
References
Sources: British Stainless Steel Association (bssa.org.uk), Stainless Steel Wire Mesh
(sswm.com.au), Metal Zenith, Machine MFG, TBK Metal, and HIDE Internal Testing.
For more information, contact HIDE Covers. +61 7 3807 2551
Australia / New Zealand: www.skimmerlids.com.au
North America / Canada / UK: www.skimmercovers.com
Europe: www.hidecovers.com