GB/T 11376-2020Metallic and other inorganic coatings--Phosphate conversion coating of metals (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 11376-1997 Phosphate conversion coatings for metals.

Compared with GB/T 11376-1997, the major changes of this Standard are as follows.

— MODIFY "Normative references" (see Chapter 2; Chapter 2 of the 1997 edition);

— ADD terms and definitions (see Chapter 3);

— MODIFY "Information to be supplied by the purchaser to the processor" (see

Chapter 4; Chapter 3 of the 1997 edition);

— MODIFY "Phosphate conversion coating types and designation" (see Chapter 5;

Chapter 4 of the 1997 edition);

— MODIFY "Phosphate conversion coating" (see Chapter 6; Chapter 6 of the 1997

edition);

— MODIFY the appendixes;

— ADD "References".

This Standard uses the redrafting method to modify and adopt ISO 9717.2017 Metallic

and other inorganic coatings - Phosphate conversion coating of metals.

The technical differences between this Standard and ISO 9717.2017 and the reasons are

as follows.

— With regard to the normative references, this Standard makes technical

adjustments to adapt to the technical conditions of China. The adjustments are

concentrated in Chapter 2 "Normative references", and the specific adjustments

are as follows.

* Use GB/T 3138 which is equivalent to the international standard to replace ISO

2080 (see Chapter 3);

* Use GB/T 4955 which is equivalent to the international standard to replace ISO

2177 (see 6.4);

* Use GB/T 4956 which is equivalent to the international standard to replace ISO

2178 (see 6.4);

* Use GB/T 9792 which modifies and adopts the international standard to replace

ISO 3892 (see 6.2);

* Use GB/T 10125 which is equivalent to the international standard to replace ISO

9227 (see 6.3);

* Use GB/T 12609 which is equivalent to the international standard to replace ISO

4519 (see Chapter 4);

* Use GB/T 16921 which is equivalent to the international standard to replace ISO

3497 (see 6.4).

This Standard makes the following editorial changes.

— ADJUST the numbers of Appendix A, Appendix B, and Appendix C according to

the order mentioned in the standard text.

This Standard was proposed by China Machinery Industry Federation.

This Standard shall be under the jurisdiction of National Technical Committee on

Metallic and Non-metallic Coating of Standardization Administration of China

(SAC/TC 57).

Drafting organizations of this Standard. Wuhan Research Institute of Materials

Protection, Wuhan Material Protection Surface New Materials Co., Ltd., Zhaoqing

University, Cwb Automotive Electronics Co., Ltd., Wenzhou Ruiming Industrial Co.,

Ltd., Foshan Kefu Technology Co., Ltd.

Main drafters of this Standard. Li Xinli, Zhong Ping, Su Hui, Yi Juan, Wu Xiaosong,

Zeng Huan, Yuan Xing, Xia Jingzhong, Xu Zhaoyu, Tan Wuyong, Lin Juan, Zhou Shuo,

He Dedao, Li Ni, Lu Yang.

The previous version - replaced by this Standard - of the standard is.

— GB/T 11376-1989, GB/T 11376-1997.

1 Scope

This Standard specifies methods for determining the requirements for phosphate

conversion coating.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this

document and are indispensable for its application. For dated references, only the

edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB/T 3138 apply.

ISO and IEC maintain terminological databases for use in standardization at the

following addresses.

4 Information to be supplied by the purchaser to the processor

The following information shall be provided by the purchaser.

5 Phosphate conversion coating types and designation

The designation of the phosphate conversion coating shall consist of the following

information.

6 Phosphate conversion coating

The coating mass is measured in accordance with the procedures specified in GB/T

9792.

The thickness of phosphate conversion coating can be measured according to the

following methods.

7 Heat treatment

Heat treatment after the phosphating is not recommended, because the phosphate layer

will be damaged at a temperature higher than 120 °C.

Appendix A

(Informative)

General information

Phosphate conversion coatings are produced by treatment with solutions, the main

constituents of which are specified in Table A.1.

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