The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Variation of thickness of hard anodic films
Author:	O'Konski, Alphons Raymond
View Online:	njit-etd1955-021 ([7], 75 pages ~ 1.8 MB pdf)
Department:	Department of Chemical Engineering
Degree:	Master of Science
Program:	Chemical Engineering
Document Type:	Thesis
Advisory Committee:	Mantell, C. L. (Committee chair) Joffe, Joseph (Committee member)
Date:	1955-06
Keywords:	Metallic films
Availability:	Unrestricted
Abstract:	An investigation was made of the effects of varying processing conditions on the thickness of anodic films produced by the Martin Hard Coat (4) process on commercially pure aluminum and nine aluminum alloys. This study was conducted to provide sufficient data for designing coating thicknesses on aircraft accessory parts that would conform to the close tolerances maintained in the course of manufacture of precision components. Coating thicknesses up to 0.0051 in. were obtained. Changes in electrolyte strength, temperature of the bath, alloy composition, and current density were made to see their effect on the thickness of the film and growth of the part. The first three aforementioned variables caused slight variations in the film thickness. Current density was the chief determinant of the thickness of the "hard coat" film. Growth of the part was only affected slightly by changes in processing conditions. The growth of the part averaged 0.41 of the over-all film thickness. Coating ratios increased with time of film formation; higher coating ratios were obtained with low strength electrolytes, low bath temperatures, and high current densities.