ISO 11408 pdf download.Chemical conversion coatings — Black oxide coating on iron and steel — Specification and test methods
1 Scope
This International Standard specifies requirements for black oxide coatings on iron and steel (including cast and wrought iron, carbon steel, low alloyed steel and stainless steel). Black oxide coatings can be used to diminish friction between sliding or bearing surfaces or for decorative purposes or to reduce light reflection. Such coatings, with or without supplementary preservative treatment, may be used where a black surface is required. Only very limited corrosion protection is obtained under mildly corrosive conditions even with preservative treatment. This International Standard does not specify requirements for the condition, finish or surface roughness of the substrate prior to black oxidizing.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents listed below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 2064:1 996, Metallic and other inorganic coatings — Definitions and conventions concerning the measurement of thickness . ISO 451 9, Metallic and other inorganic coatings — Sampling procedures for inspection by attributes . ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests . ISO 9587, Metallic and other inorganic coatings — Pre-treatments of iron and steel to reduce the risk of hydrogen embrittlement . ISO 9588, Metallic and other inorganic coatings — Post-coating treatments of iron and steel for reducing the risk of hydrogen embrittlement
3 Term and definition
For the purposes of this International Standard, the following term and definition apply. 3.1 significant surface part of the article covered or to be covered by the coating and for which the coating is essential for serviceability and/or appearance and where the coating has to meet all of the specified requirements [ISO 2064:1 996, definition 3.1 ]
4 Information to be supplied by the purchaser to the supplier
4.1 Essential information When ordering articles to be black oxide coated in accordance with this International Standard, the purchaser shall provide the supplier with the following information: a) the number of this International Standard, i.e. ISO 1 1 408; b) the significant surface of the article to be coated, indicated, for example, on a drawing or by the provision of suitably marked samples; c) the nature and surface condition (see clause 5) of the substrate; d) the sampling procedure to be adopted (see clause 8); e) the appearance of the coating, e.g. by the provision of a suitably marked sample (see 7.1 ). 4.2 Additional information The following additional information may be provided by the purchaser as appropriate: a) whether the neutral surface reaction has to be tested (see B.1 ); b) whether porosity and continuity (gross defect) of the black oxide coating has to be tested (see B.2); c) any requirements for supplementary preservative treatment (e.g. oil, wax or lacquer films) and humidity testing after such treatment; d) any requirements for heat treatment before and/or after black oxidizing (see clause 6); e) any requirements for oxalic acid resistance testing (see 7.2); f) any requirements for wear resistance and its measurement; g) any requirements for coefficient of friction and its measurement; h) any requirements for resistance to neutral salt spray (see 7.3); i) any requirements for adhesion with thicker black oxide coatings.