GB/T 39495-2020Metallic and other inorganic coatings—Chromate-free chemical conversion coatings on allumion and its alloys (English PDF)
金属及其他无机覆盖层 铝及铝合金无铬化学转化膜
This is a limited preview
Buy now to download the full PDF (15 pages)
Need quotation for your management?
Get a formal quotation for GB/T 39495-2020 in 30 minutes.
Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 19, 2020
Implementation date
October 1, 2021
Scope
GB/T 39495-2020 is the English-translated version of 金属及其他无机覆盖层 铝及铝合金无铬化学转化膜.
GB/T 39495-2020 is the Chinese standard "Metallic and other inorganic coatings—Chromate-free chemical conversion coatings on allumion and its alloys".
Its scope clause reads: This standard specifies the classification, requirements, test methods and sampling inspection procedures for aluminum and aluminum alloy water-washed and no-clean chromium-free chemical conversion coatings.
This standard applies to chromium-free chemical conversion coatings for extruded aluminum and aluminum alloy parts, profiles, coils, plates and cast aluminum alloy parts.
The chromium-free chemical conversion coating can be used as an anti-corrosion layer alone or as the bottom layer of an organic coating (such as paint, rubber, adhesive). Its clauses include terms and definitions.
Found what you need?
Document preview — GB/T 39495-2020
National Standard of the People's Republic of China
- ICS
- 25.220.20
- Classification
- A 29
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 3.1 Conversion coating
- 3.2 Chemical conversion coating
- 3.3 Chromium-free chemical conversion coating
- 3.4 Washable chromium-free chemical conversion coating
- 3.5 No-clean chromium-free chemical conversion coating
1 Scope
This standard specifies the classification, requirements, test methods and sampling inspection procedures for aluminum and aluminum alloy water-washed and no-clean chromium-free chemical conversion coatings.
This standard applies to chromium-free chemical conversion coatings for extruded aluminum and aluminum alloy parts, profiles, coils, plates and cast aluminum alloy parts.
The chromium-free chemical conversion coating can be used as an anti-corrosion layer alone or as the bottom layer of an organic coating (such as paint, rubber, adhesive).
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB/T 3138 Terminology for surface treatment of metal and other inorganic coatings
GB/T 6461 Rating of samples and test pieces of metal and other inorganic coatings on metal substrates after corrosion tests
GB/T 9286 Cross-cut test of paint and varnish film
GB/T 10125 Artificial atmosphere corrosion test salt spray test
GB/T 12609 Electrodeposited metal coating and related finishing inspection sampling procedures
GB/T 20017 Determination of the mass per unit area of metal and other inorganic coatings. A review of gravimetric and chemical analysis methods
QJ1827 Low-resistance metal coating and chemical conversion film contact resistance test method
3 Terms and definitions
The following terms and definitions defined in GB/T 3138 apply to this document.
3.1 Conversion coating
A surface covering layer containing a base metal compound formed by a chemical or electrochemical process.
3.2 Chemical conversion coating
The base metal reacts with the conversion solution to form a surface covering layer containing the base metal compound.
3.3 Chromium-free chemical conversion coating
A chemical conversion film formed by a conversion solution that does not contain chromium (hexavalent, trivalent).
3.4 Washable chromium-free chemical conversion coating
After the conversion treatment, the chromium-free chemical conversion coating needs to be washed with water and then dried.
Note. This type of conversion film is generally used in extruded aluminum products and cast aluminum parts.
3.5 No-clean chromium-free chemical conversion coating
After the conversion treatment, no water washing is required, and a dry chromium-free chemical conversion coating is directly applied.
Note 1.This special conversion film is generally used for thin aluminum plates that are immediately coated or coated with adhesives.
Note 2.No-clean conversion coatings are being studied for more welded parts and castings.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Similar standards
How to Download GB/T 39495-2020
- 1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
- 2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
- 3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
- 4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.
Related Standards
GB/T 10003-2026 — Biaxially oriented polypropylene (BOPP) film
GB/T 10004-2026 — Plastic/Plastic laminated films and pouches for packaging
GB/T 10007-2026 — Rigid cellular plastics - Determination of shear properties
Secure payment via Stripe
Payments accepted
GB/T 39495-2020
$135.00