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QC/T 1222.1-2025: Automobile engines - Inspection method for surface treatment of piston rings - Part 1: Chromium based ceramic composite coating
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| QC/T 1222.1-2025 | English | 279 |
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Automobile engines - Inspection method for surface treatment of piston rings - Part 1: Chromium based ceramic composite coating
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QC/T 1222.1-2025
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Basic data | Standard ID | QC/T 1222.1-2025 (QC/T1222.1-2025) | | Description (Translated English) | Automobile engines - Inspection method for surface treatment of piston rings - Part 1: Chromium based ceramic composite coating | | Sector / Industry | Automobile & Vehicle Industry Standard (Recommended) | | Classification of Chinese Standard | T12 | | Classification of International Standard | 43.060 | | Word Count Estimation | 14,126 | | Date of Issue | 2025-05-09 | | Date of Implementation | 2025-11-01 | | Issuing agency(ies) | Ministry of Industry and Information Technology of the People's Republic of China | QC/T 1222.1-2025: Automobile engines - Inspection method for surface treatment of piston rings - Part 1: Chromium based ceramic composite coating
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QCT1222.1-2025
ICS 43.060CCS T 12
Automobile Industry Standards of the People's Republic of China
Released on May 9, 2025
2025-11-01Implementation
Ministry of Industry and Information Technology of the People's Republic of China issued
Inspection method for surface treatment layer of automobile engine piston ring
Part 1.Chromium-based ceramic composite coatings
Automobile engines-Inspection method for surface treatment of piston rings-
Part 1：Chromium based ceramic composite coating
Table of Contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Type and composition 2
5.Inspection Method 2
Figure 1 Coating Classification 2
Figure 2 Coating composition structure 2
Figure 3 Sample preparation example 3
Figure 4 Schematic diagram of sample grinding
Figure 5 Diagonal method for measuring reticulation density (200×) 5
Figure 6 Image analysis system to detect ceramic particle content 5
Table 1 Determination of strength after twisting 6
Table 2 Fracture morphology strength determination 6
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is the first part of QC/T 1222 "Test method for surface treatment layer of automobile engine piston ring".
The following parts are published.
-- Part 1.Chromium-based ceramic composite coatings;
--Part 2.PVD coating.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed and coordinated by the National Technical Committee for Standardization of Automotive Products (SAC/TC 114).
This document was drafted by. Anqing Diberg Piston Ring Co., Ltd., Huaminnan Piston Group Co., Ltd., Binzhou Bohai Piston Co., Ltd.
Company, Yizheng ASIMCO Shuanghuan Piston Ring Co., Ltd., Nanjing Feiyan Piston Ring Co., Ltd., and FAW Jiefang Dalian Diesel Engine Co., Ltd.
The main drafters of this document are. Wang Xing, Wang Youyu, Jiang Dianchang, Ding Wei, Zhang Yi, Guo Xiying, and Cheng Weisheng.
introduction
QC/T 1222 "Test Method for Surface Treatment Layer of Automobile Engine Piston Rings" aims to standardize the different surface coatings of automobile engine piston rings.
Terms and definitions, types and composition, and inspection methods.
QC/T 1222 is intended to consist of four parts.
-- Part 1.Chromium-based ceramic composite coatings. The purpose is to establish the terminology and
Definition, type and composition, and inspection method.
-- Part 2.PVD coatings. The purpose is to establish the terms and definitions, types and compositions applicable to PVD coatings for engine piston rings.
Composition and inspection methods.
-- Part 3.Chromium-based diamond composite coatings. The purpose is to establish the technical specifications for chromium-based diamond composite coatings for engine piston rings.
Terms and definitions, types and composition, and inspection methods.
-- Part 4.DLC coating. The purpose is to establish the terms and definitions, types and compositions of DLC coatings applicable to engine piston rings.
Composition and inspection methods.
Inspection method for surface treatment layer of automobile engine piston ring
Part 1.Chromium-based ceramic composite coatings
1 Scope
This document specifies the terms and definitions, types and composition, and inspection methods for chromium-based ceramic composite coatings for automotive engine piston rings.
This document is applicable to the inspection of chromium-based ceramic composite coatings on automobile engine piston rings with cylinder diameters less than or equal to 160 mm.
It is used as a reference for the inspection of composite coatings on large-diameter and large-cylinder piston rings.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.
document.
GB/T 1149.1 Internal combustion engine piston rings Part 1.General rules
GB/T 1149.2 Internal combustion engine piston rings Part 2.Terminology
GB/T 4340.1 Metallic materials Vickers hardness test Part 1.Test method
GB/T 6462 Measurement of thickness of metal and oxide coatings - Microscope method
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
Chromium based ceramic composite coating
A composite coating composed of ceramic particles embedded in a multi-layer chromium layer is electroplated on the outer surface of the piston ring by using a positive and reverse current electroplating method.
3.2
ceramic particlesceramic particles
It is a tiny particle made of ceramic material with the characteristics of high hardness, strong wear resistance, heat resistance and corrosion resistance.
Note. Such as aluminum oxide particles (Al2O3), boron nitride particles (BN), silicon carbide particles (SiC), etc.
3.3
reticulate pattern
Used to fill grooves with ceramic particles.
3.4
reticulation density
The number of reticular stripes per unit length of the coating structure.
3.5
Particle content
The proportion of ceramic particles in a unit coating layer.
Note. This includes the percentage of particles per unit area, the percentage of particles per unit volume, and the percentage of particles per unit mass.
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