C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 2/02 (2006.01) B05D 3/00 (2006.01) C23C 2/08 (2006.01) C23F 1/30 (2006.01) C23F 1/44 (2006.01) C23F 15/00 (2006.01) C25D 5/36 (2006.01) C25D 5/48 (2006.01) E04B 1/00 (2006.01)
Patent
CA 2092747
Various metal coatings have been used for many years to inhibit oxidation of metals exposed to the natural elements of the atmosphere over a period of time. Terne alloy coatings which normally contain about 20% tin and about 80% lead are some of the most popular metal coating treatments to resist corrosion. The special formulation of the present invention reformulates the terne coating to constitute a tin and lead based coating where tin constitutes at least 90% of the terne and lead amounts to less than 0.1% and preferably less than 0.05% of the terne. The low lead terne coating may also include antimony arid bismuth to provide strength and hardness to the low lead terne formulation having corrosion resistive qualities similar to that of standard terne coating formulations. A weather-resistant strip roofing material is also disclosed and which has improved corrosion-resistant properties includes a strip of stainless steel which is pre-treated by an aggressive pickling process and/or a chemical activating process prior to applying a hot-dip tin coating. The pre-treatment of the stainless steel strip produces superior alloying between the stainless steel and the tin coating which reduces flaking of the tin coating.
Carey Jay F. II
Zamanzadeh Mehrooz
Gowling Lafleur Henderson Llp
The Louis Berkman Company
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