GALVANIC CORROSION SERIES
14 The Importance of Material Selection
Inground
LEAST REACTIVE
Platinum Gold Graphite Silver Stainless steel ( type 316 ) Stainless steel ( type 304 )
STAINLESS STEEL SS316
Lumascape uses 316 Stainless Steel in many luminaires for its excellent corrosion resistance in harsh environments .
316 Stainless Steel is commonly referred to as ‘ Marine Grade ’ for its excellent resistance to crevice corrosion and pitting in chloride environments ( i . e . coastal / marine areas ).
The Galvanic Corrosion Series ( displayed to the left ) grades the reactiveness of various common metals . After precious metals , 316 Grade Stainless Steel is the next best option .
The use of 316 Marine Grade Stainless Steel and other high grade materials by Lumascape is why we offer a 10 year structural warranty on our Stainless Steel inground luminaires , and 5 years on underwater luminaires .
GALVANIC CORROSION SERIES
Titanium 13 % chromium stainless steel ( type 410 ) Nickel ( passive ) Silver solder Silicon bronze Copper Red brass Yellow brass Nickel ( active ) Manganese bronze Tin Lead Cast iron Mild steel Aluminum 2024 Cadmium Aluminum 6053 Galvanized steel Zinc Magnesium alloys Magnesium
ropo electropolish + tm
At Lumascape , we use a 3-stage finishing process on most Stainless Steel luminaires . It ' s called ElectroPolishPlus™ and it ensures your stainless stays ‘ stainless ’ for a long time .
The following describes the process of ElectroPolishPlus™ .
Machining
Machining stainless steel disrupts the natural Chromium Oxide ( Cr 2
O 3
) layer that gives Stainless Steel its superior corrosion resistance .
After machining , some carbide deposits and other impurities are left over .
Step 1 : Pickling This process cleans the surface of all impurities .
Step 2 : Polishing
This process smooths the surface , so chlorides and other active particles cannot become lodged on the surface .
Step 3 : Passivation This final stage in the process reforms a layer of Cr 2
O 3 of even thickness over the surface , for maximum corrosion resistance .
MOST REACTIVE