IS 13212 : 1991 Blackoxide coatings for iron and steel parts

1 Scope

1.1 This standard specifies the requirements of black oxidecoating (also known as chemical blackening) on iron and steelparts.

1.1.1 This finish should not be specified for use whereprotection against humid or corrosive environment is required, andon assemblies containing other than iron and steel parts, and inplaces where the areas are capable of trapping the blackeningchemical.

1.1.2 This coating shall be applied after all machining,forming, welding, cold straightening, and heat-treatment processes.

2 Reference

IS 11826 : 1986Recommended practice for chemical colouring forengineering components in general and for bicyclecomponents is necessary adjunct to this standard.