METHOD FOR PRODUCING HARD PROTECTION COATINGS ON A

专利名称：METHOD FOR PRODUCING HARD

PROTECTION COATINGS ON ARTICLESMADE OF ALUMINIUM ALLOYS

发明人：SHATROV, Alexandr Sergeevich申请号：EP97955055.5申请日：19971217公开号：EP1050606A1公开日：20001108

摘要：The proposed invention relates to the sphere of plasma electrolytic oxidecoating of aluminium alloys. The method incorporates anode-cathode oxide coating in analkaline electrolyte at a temperature of 15-50°C, using 50-60 Hz frequency alternatingcurrent. In the initial stage of the process oxide coating is carried on for 5-90 seconds at acurrent density of 160-180 A/dm, then the current density is dropped to 3-30 A/dm andthe process is continued in a regimen of spontaneous diminution of power demandwithout on-line adjustment of the regimen until the set coating thickness is achieved. Thealkaline electrolyte used is an aqueous solution of alkaline metal hydroxide at 1-5 g/l, analkaline metal silicate at 2-15 g/l, an alkaline metal pyrophosphate at 2-20 g/l andperoxide compounds at 2-7 g/l (in terms of HO - 30%). The proposed method enablesthe protective properties of ceramic oxide coatings to be enhanced through an increasein the micro-hardness, density and strength of adhesion to the substrate without anyadditional energy outlay or time required.

申请人：Isle Coat Limited

地址：Prospect Chambers, Prospect Hill Douglas, Isle of Man, IM1 2PT GB

国籍：GB

代理机构：Harrison Goddard Foote

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