ISO 10074 pdf download – Anodizing of aluminium and its alloys -Specification for hard anodicoxidation coatings on aluminium andits alloys

ISO 10074 pdf download – Anodizing of aluminium and its alloys -Specification for hard anodicoxidation coatings on a8 Resistance to wear/abrasion
8.1 General
The resistance to wear/abrasion shall he measured on unsealed anodic oxidation coatings (see NOTE). Due to good correlation achieved with other properties, resistance to wear/abrasion shall be tested in accordance with lii. using the abrasive wheel wear test method described in ISO 8251.
NOTE Resistance to abrasion can be rnea’ured on sealed anodic oxidation coatrngs but hydrothermal sealing and/or dyeing can reduce the resistance to abrasion/wear by over 50%.
When the abrasive wheel wear test method is not appropriate (especially on some curved surfaces). resistance to wear/abrasion shall be tested In accordance wIth fl2. using the abrasive jet test method described in ISO 82S1. This test gives an average for the total coating thickness.
The abrasive wheel wear test method assesses the resistance to abrasive wear. The abrasive jet test method assesses the resistance to erosive wear (erosion). Thus, the results are not necessarily comparable.
The Taber abrasion test method in accordance with 8.3 may only he used when specified.
8.2 Abrasive wheel wear test method
The resistance to wear/abrasion shall be determined by the measurement of loss in coating thickness or loss in coating mass. When determined in accordance with 8.1. using the abrasive wheel test method described In ISO 8251, the final value shall be an average of at least three tests using a load of 19,6 N ± 0,5 N and grade P240 silicon carbide paper (as described in ISO 6344-1). The loss in coating thickness or in coating mass shall exclude any loss due to the pretest abrasion.
The acceptance values shall be in accordance with Tahlei. The standard specimen, in accordance with Annexc. shall be tested each day, under the same conditions as those used for the test specimen. When the loss In coating thickness is used, each thickness value shall be the average of 10 readIngs In the test area.
The time between hard anodizing and abrasion testing shall be at least 24 h. During this period, the test specimens shall be stored in the test environment.
luminium andits alloys.
H.1 General
The equipment and processes employed should provide anodic oxidation coatings which meet the requiremLnts of this documcnt.
Unless otherwise agreed, the processing conditions should be decided upon by the anodizer,
11.2 Masking (optional)
The purpose of masking is to prevent the treatment of certain areas of the article, especially for articles
containing parts which are not made of aluminium but of steel, brass or organic substances.
The different techniques available include:
— wax;
— varnishorpaint;
— mechanical masking:
— use of traditional anodizing (such as chromic acid anodizing).
H.3 Jigging
The jigs should be made of aluminium alloy or titanium to ensure easy handling of articles and good electrical and mechanical contact.
The junction between article and jig should generally be achieved by clamping or bolting
11.4 Degreasing
Surfaces should he clean and Free from grease, oil, oxide, scale or other foreign matter. Different methods of degreasing available include:
— degreasing by immersion in a solvent;
— dcgreaslng using a vapour phase solvent;
— alkaline or acid degreasing.
H.5 Pickling or etching (optional)
Pickling or etching can be used to prepare a deoxidized surface. However, it is seldom used before hard anodizing because of its effect on surface roughness. If it is necessary, an appropriate acid solution should be used.