![]() ![]() ![]() In the case of security screens, the aluminium is more active than the stainless steel mesh or any stainless steel fasteners, and so will corrode first, while the stainless steel will be protected by this galvanic phenomenon. WHEN TWO DISSIMILAR METALS ARE CONNECTED OR IN CONTACT AND ARE IN THE PRESENCE OF A CONDUCTING ELECTROLYTE SUCH AS WATER OR EVEN DUST, THE MORE ACTIVE METAL WILL CORRODE AND PROTECT THE LESS ACTIVE METAL.Īluminium is more active than stainless steel and will preferentially corrode in the vicinity of the contact zone between the metals. ![]() And unlike some other competing products your warranty is not subject to the ongoing use of a proprietary cleaning product. You can rest assured your new security doors and screens will look great for years with only a moderate amount of maintenance. Invisi-Gard Stainless Steel Security Products use only 316 Marine Grade Stainless Steel. Grade 316 has virtually the same mechanical, physical and fabrication characteristics as 304 with better corrosion resistance, particularly to pitting corrosion. It resists ordinary rusting in virtually all architectural applications, and is often chosen for more aggressive environments such as sea-front buildings and fittings on wharves and piers. Its main advantage over grade 304 is its increased ability to resist pitting and crevice corrosion. Grade 316 has excellent corrosion resistance in a wide range of media. The less expensive grades (such as 304) will probably become tea stained or even suffer more severe corrosion. Damage by abrasion, cutting or machining is quickly repaired. The film is rapidly self-repairing in the presence of oxygen. Although extremely thin, this invisible, inert film is tightly adherent to the metal and extremely protective in a wide range of corrosive media. This resistance to attack is due to the naturally occurring chromium-rich oxide film formed on the surface of the steel. Stainless steel is a generic term for a family of corrosion resistant alloy steels containing 10.5% or more chromium.Īll stainless steels have a higher resistance to corrosion than their mild steel counterparts. ![]()
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