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Steel is the most widely applied material for long-span structure,but how to protect a steel structure from corrosion is a challenge for it. Painted steel buildings can not serve long and the stainless steel and aluminum are prohibitively expensive. LF space frame structure is processed with maintain-free durable materials which are galvanized. The structure needs no maintenance once completed in low price and risk happened during maintaining especially for some huge building with higher risks. We also provide another economical option for special paint finishing which doesn’t need to maintain more than 15 years.The whole structure is easy for maintenance, and can be used for more than 50 years;
|
Criteria |
Hot-dip galvanizing |
Electro-galvanizing |
Paint |
|
Corrosion Protection |
Cathodic & barrier |
Cathodic & barrier |
Barrier |
|
Coverage on corners/edges |
Uniform coverage including corners, edges, and threads |
Maybe thin or no coating in difficult to access areas |
Holidays and pin holes possible, coating tends to thin on edges/corners |
|
Coating thickness |
1.7 to 3.4 mils |
0.2 mils |
1-3 mils |
|
Bond strength |
3,600 psi |
300-600 psi |
300-600 psi |
|
Hardness |
Alloy layer harder than base steel, with DPN hardness ranging from 179-250 |
50% as hard as base steel |
Soft & susceptible to handling damage |
|
Temperature range |
-100 C to 200 C |
-100 C to 200 C |
Dependent on formulation |
|
Paintability |
Can be painted |
Can be painted |
n/a |
|
Application |
Shop |
Shop |
Shop or field |
|
Conditions |
Independent of weather |
Independent of weather |
Temperature & humidity restrictions |
|
Procedure |
After cleaning with series of chemicals, dipped in molten zinc bath, then spun to remove excess zinc |
Clean steel, immerse parts in a zinc acid bath, and drive current through bath |
Clean steel rinse, dry, brush or spray multiple coats |
|
Performance: Time to first maintenance |
50+ years |
10+ years |
10-20 years |
|
Suitability |
Outdoor and indoor, applications |
Outdoor sparingly, indoor main applications |
Outdoor and indoor applications |
