مشخصات و روش آزمون پوشش اکسید سیاه (سیاهکاری) آهن و استیل

Chemical conversion coatings Ð Black oxide coating on iron and steel Ð Specification and test methods

Contents Page 1 Scope ........................................................................................................................................................................1

2 Normative references ..............................................................................................................................................1

3 Term and definition .................................................................................................................................................1

4 Information to be supplied by the purchaser to the supplier..............................................................................2

4.1 Essential information ...........................................................................................................................................2

4.2 Additional information .........................................................................................................................................2

5 Substrate ..................................................................................................................................................................2

6 Heat treatment of steels ..........................................................................................................................................2

6.1 General...................................................................................................................................................................2

6.2 Heat treatment before black oxidizing................................................................................................................3

6.3 Heat treatment after black oxidizing...................................................................................................................3

7 Requirements...........................................................................................................................................................3

7.1 Appearance and surface quality .........................................................................................................................3

7.2 Oxalic acid test resistance...................................................................................................................................3

7.3 Resistance of austenitic stainless steels to neutral salt spray........................................................................3 8 Sampling...................................................................................................................................................................3

Annex A (informative) Processing procedures for iron and stainless steels........................................................6

Annex B (informative) Methods of test for neutral surface reaction and for porosity and continuity................7