1 Scope
This standard specifies standard procedures and requirements for the detection and classification of localized overheating on ground surfaces by chemical etch methods.
This standard is applicable to steel parts such as gears, shafts, splines and bearings.
It is not applicable to nitrided parts and stainless steels.
These chemical etch methods are more sensitive to changes in surface hardness than most hardness testing methods.
The surface temper etch procedure is to be performed after grinding and before additional finishing operations.
2 Equipment
2.1 Container materials
Container materials shall not react with the solutions contained, nor damage the parts to be processed. All containers shall be labelled with the solution contained and covered when not in use.
2.2 Inspection area
The area to be inspected shall be sufficiently illuminated to be free of shadows and reflections. Light capable of ensuring 3 200 lux (300 foot candles) at the inspection level is recommended.
2.3 Timing device
A suitable timing device shall be used for the uniform processing of all parts in a group.
2.4 Cleaner
An alkaline cleaner, vapour degreaser, solvent wash, or equivalent cleaning process should be used.
3 Reagents
All chemicals shall be technical grade or better.
3.1 Cleaning materials
Cleaning materials shall be used which are capable of ensuring removal of all dirt, grit, grease and oil, to obtain a "water break" free surface. A "water break" free surface is one which maintains a continuous water film for a minimum period of 15 s after having been rinsed in clean water at a temperature below 40°C.
Foreword II
ISO Foreword III
ISO Introduction IV
1 Scope
2 Equipment
3 Reagents
4 Procedure
5 Inspection Criteria
6 Rework of Surface-tempered Parts
7 Temper Etch Removal
8 Maintenance and Control
9 Safety and Environmental Precautions
