公开(公告)号：US3846170A

公开(公告)日：1974-11-05

申请号：US28817372

申请日：1972-09-11

Applicant: FUJIKURA LTD

Inventor： ISAWA K ,  MAEJIMA M ,  KIUCHI K ,  YOKOTA K ,  OGAWA M

IPC: C23C22/00 ,  C23C22/67 ,  H01B13/16 ,  B44D1/18 ,  C23F7/26

CPC classification number: C23C22/67

Abstract: 1. A METHOD OF FORMING AN ELECTRICALLY INSULATING COATING OF ALUMINA AND CHROMIUM OXIDE ON THE SURFACES OF ALUMINUM OR ALUMINUM ALLOY WIRES WHICH COMPRISES PASSING THE WIRES OF ALUMINUM OR AN ALUMINUM ALLOY THROUGH A CHEMICAL CONVERSION TREATING SOLUTION HELD AT 80 TO 110* C. CONTAINING SODIUM CARBONATE AND SODIUM CHROMATE IN A CONCENTRATION OF 20 TO 200 GRAMS PER LITER OF WATER AND IN WHICH THE WEIGHT RATIO OF SODIUM CARBONATE TO SODIUM CHROMATE RANGES FROM 10:5 TO 10:10 TO FORM AN ELECTRICALLY INSULATING COATING OF ALUMINA AND CHROMIUM OXIDE ON THE WIRES.