ISO 8075:2025
(Main)Aerospace — Surface treatment of hardenable stainless steel parts
Aerospace — Surface treatment of hardenable stainless steel parts
This document specifies the requirements for technical procedures, quality inspection, etc. for the surface treatment of martensitic, precipitation hardening and maraging stainless steel parts (e.g.400 series, 17-7PH, 17-4PH, 15-5PH, AM350, AM355, PH15-7Mo, PH13-8Mo, Custom 450 and 455 or equivalent). It provides practical methods for removing contaminants and for obtaining suitable corrosion resistance for aerospace applications. This document applies to the removal of organic and inorganic contaminants, surface cleaning, surface finishing and surface passivation before non-destructive inspection of martensitic, precipitation hardening and maraging stainless steel parts.
Aéronautique et espace — Traitement de surface des éléments en acier inoxydable à durcissement structural
General Information
Relations
Standards Content (Sample)
International
Standard
ISO 8075
Second edition
Aerospace — Surface treatment of
2025-05
hardenable stainless steel parts
Aéronautique et espace — Traitement de surface des éléments en
acier inoxydable à durcissement structural
Reference number
© ISO 2025
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Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Technical requirements . 2
4.1 General .2
4.2 Technical requirements .2
4.3 Process details .3
4.3.1 Degreasing cleaning .3
4.3.2 Stress relief .3
4.3.3 Removal of scale and oxides .4
4.3.4 Smoothing surface .5
4.3.5 Passivation .6
4.3.6 Hydrogen embrittlement relief bake .7
4.3.7 Rinse and dry .7
4.3.8 Rework .8
5 Quality control . 8
5.1 Responsibility for inspection.8
5.2 Batch acceptance tests .8
5.2.1 Appearance .8
5.2.2 Corrosion resistance .8
5.3 Process control tests .8
5.4 Process qualification tests .8
5.5 Solution control . .9
5.6 Inspection and test .9
5.6.1 Appearance .9
5.6.2 Corrosion resistance .9
5.7 Approval .10
6 Packaging and delivery . 10
6.1 Packaging .10
6.2 Delivery .11
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Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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this may not represent the latest information, which may be obtained from the patent database available at
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This document was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 18, Materials.
This second edition cancels and replaces the first edition (ISO 8075:1985), which has been technically
revised.
The main changes are as follows:
— added the normative references in Clause 2;
— added rinse and dry (see 4.3.7);
— added rework (see 4.3.8);
— made the requirements of process control tests and process qualification tests clearer (see 5.3 and 5.4).
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
International Standard ISO 8075:2025(en)
Aerospace — Surface treatment of hardenable stainless
steel parts
1 Scope
This document specifies the requirements for technical procedures, quality inspection, etc. for the surface
treatment of martensitic, precipitation hardening and maraging stainless steel parts (e.g.400 series, 17-
7PH, 17-4PH, 15-5PH, AM350, AM355, PH15-7Mo, PH13-8Mo, Custom 450 and 455 or equivalent). It provides
practical methods for removing contaminants and for obtaining suitable corrosion resistance for aerospace
applications.
This document applies to the removal of organic and inorganic contaminants, surface cleaning, surface
finishing and surface passivation before non-destructive inspection of martensitic, precipitation hardening
and maraging stainless steel parts.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
batch
parts processed in the same passivation tank and within the same time period
3.2
water-break-free
surface that maintains a continuous water film for a period of at least 30 s after having been sprayed or
immersion-rinsed in clean water at a temperature below 38 °C
3.3
room temperature
ambient temperature of the production site
Note 1 to entry: The room temperature for the surface treatment of the parts should be controlled at 12 °C to 38 °C.
4 Technical requirements
4.1 General
4.1.1 Before any heat treatment (e.g. annealing, welding) required in the manufacturing process, all
surfaces of the part shall be treated in accordance with one or more of the following:
a) degreasing and cleaning of organic pollutants and other carbide pollutants shall be in accordance
with 4.3.1;
b) contaminants such as oxides, scales, and discolorations shall be treated in accordance with 4.3.2;
c) metal contamination (other than sheet parts for shearing and hole-making only, 440c stainless steel for
annealing only, or heat treatment temperatures below 650 °C) shall be passivated in accordance with 4.3.5.
4.1.2 Before finishing and passivation, the parts should have completed all processing operations (such as
forming, machining, heat treatment, welding), and the surface should be clean and free from pits, scratches
and mechanical damage.
4.1.3 A final surface passivation shall be carried out, except when a surface coating is specified
(e.g. painting, electroplating).
4.1.4 When a coating is specified as only part of the surface of the part, the part without coating shall be
passivated in accordance with the requirements of this document.
4.1.5 When conducting non-destructive inspection of stainless steel materials covered by this document,
a magnetic particle inspection should be employed. Before the inspection, degreasing cleaning or descaling
treatment, or both of them, shall be carried out; when a penetrant inspection is used, pickling shall be
carried out to remove metals that can affect the inspection results. If the surface is smeared, at least 5 μm of
the surface should be removed.
4.1.6 It is the responsibility of the operator to determine, based on analysis or history, that the condition
of the surface prior to treatment conforms to the requirements of this document.
4.2 Technical requirements
4.2.1 The process shall meet the requirements of this document.
4.2.2 The process should be subject to an appropriate solution control by recognized methods of chemical
analysis.
4.2.3 Suppliers of proprietary chemicals shall provide processors with analytical methods and instructions
for solution maintenance in writing.
4.2.4 Th
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