Rothoblaas - Wood screws and connectors Page 253
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ADDITIONAL POSSIBLE CORROSION FACTORS GALVANIC COUPLING Nickel-Chrome_Mo Alloys Titanium, Silver, Graphite Graphite, Gold, Platinum Nickel copper alloys Bronzes, cupro-nickels Copper Brasses, nickel silvers Nickel Lead, tin and alloys Stainless steels Cast iron Steel-carbon Cadmium Alluminium & alloys Zinc & alloys Metal Corroding Magnesium & alloys Contact Metal This occurs when metals of different nobility are placed into contact with one another and are both immersed in an electrolyte. HUMIDITY IN THE WOOD Magnesium & alloys Zinc & alloys Alluminium & alloys Cadmium Steel-carbon Cast iron Stainless steels PH OF THE WOOD Lead, tin and alloys Nickel Brasses, nickel silvers Copper Bronzes, cupro-nickels Nickel copper alloys Nickel-Chrome_Mo Alloys Titanium, Silver, Graphite Graphite, Gold, Platinum PROTECTIVE TREATMENTS FIREPROOFING OR FLAME-RETARDANT TREATMENTS To achieve effective corrosion protection, careful design of connection and construction details is essential. Careful consideration must be given to environmental conditions such as humidity, temperature, exposure of the wood, marine air pollution, the presence of chemicals and the type of wood. It is generally impossible to determine — in advance and beyond a shadow of a doubt — where the corrosion will take place and (in some cases) by what mechanism, as it is a statistical phenomenon. USE OF FERTILIZERS, DETERGENTS, THAWING SALTS OR FUNGICIDES In order to find the best solution to protect the connectors from corrosion, the ideal approach involves the following steps: 1. Analysis of the working environment and environmental conditions; 2. Analysis of the most likely or predominant phenomenon; 3. Selection of the best material taking into account the two previous points; 4. Periodic monitoring. INSTALLATION GEOMETRY OUTDOOR | CORROSION | 253
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