SAE J447-2016

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SURFACE VEHICLE

INFORMATION REPORT

J447™

APR2016

Issued 1956-01

Revised 1995-07

Stabilized 2016-04

Superseding J447 JUL1995

Prevention of Corrosion of Motor Vehicle Body and Chassis Components

RATIONALE

This document covers technology, products, or processes for which technical expertise no longer resides in the owning

committee.

STABILIZED NOTICE

This document has been declared "Stabilized" by the SAE Materials, Processes and Parts Council and will no longer be

subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability of

technical requirements. Newer technology may exist.

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Foreword—Prevention of corrosion is an important design consideration for metals used in body and chassis

components. In some cases, corrosion resistance may be the dominating factor governing the selection of

material or process; in others, it will be secondary to manufacturing feasibility, appearance requirements, and

availability. Means of preventing or retarding corrosion on specific parts may be important from the standpoint of

assuring proper engineering function, contributing to service life, or producing and maintaining appearance. The

designer should be familiar with the part that corrosion prevention plays in the selection of metal and/or treatment,

so that the performance complies with the requirements.

With the use of salt for de-icing and dust control increasing at a rapid rate for the past decade, corrosion problems

have been recognized as ones of primary importance. Components experiencing the most severe corrosion are

those exposed to road splash thrown up by the wheels. Salt and mud poultices built up in these areas hold

moisture in contact with the metal parts and extend the periods of wetness, which in turn accelerate deterioration

by corrosion. The best way to prevent corrosion is to keep these critical surfaces free from prolonged contact with

salt and mud. Therefore, the owner can help prevent corrosion by washing the vehicle, including the underbody,

particularly during periods of high salt exposure.

This report is intended to provide information covering the corrosion preventive methods commonly used for both

ferrous and nonferrous metals. The particular practices discussed are those considered typical within the

automotive industry, but are believed applicable to parts and products for many other applications. Care has been

taken to provide reliable data, but users should supplement this with their own experience and tests to be assured

of satisfactory results for their own specific requirements. Optional methods may be equally suitable for typical

classes of parts, and the choice may vary, with acceptable results. In some instances the preferred type of finish,

coating, or treatment is indicated. Within the limits of whatever restrictions apply, after the selection is made,

quality requirements are met by establishing suitable specifications, process controls, and acceptance tests.

The choice of corrosion preventive methods is greatly affected by the environmental and other conditions to which

the part will be subjected in use, such as:

a. Moisture

b. Temperature

c. Salt

d. Galvanic Couples

e. Abrasion

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J447™ APR2016

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The applicable conditions of service should be evaluated and protection provided in terms of the expected life of

the part. Also, the part design may have an important effect on prevention of corrosion in severe environments and

should be considered in relation to the materials and/or treatments and coatings. Trapped moisture, lack of

ventilation, crevices, and other design details or effects of design may be significant.

In general, the corrosion preventive requirements of most automotive parts may be satisfied by a combination of

the following:

a. Selection of material

b. Design considerations

c. Choice of protective treatments and/or coatings

The application of treatments or coatings to metal almost always requires some form of cleaning or other

preparation for satisfactory results. Variations required for different coatings will be covered where they are

considered important to the results obtained.

A general discussion of the methods, characteristics of materials, and specific applications is given in subsequent

test.

TABLE OF CONTENTS

1. Scope........................................................................................................................................................4

2. References................................................................................................................................................4

2.1 Applicable Documents ..............................................................................................................................4

2.1.1 SAE Publications ......................................................................................................................................4

2.1.2 ASTM Publications....................................................................................................................................4

2.1.3 SME Publications......................................................................................................................................5

2.1.4 Other Publications.....................................................................................................................................5

2.2 Related Publications .................................................................................................................................6

3. Glossary of Corrosion-Related Terms.......................................................................................................7

4. Chapter 1—Principles of Corrosion ........................................................................................................10

4.1 Electrochemical Theory ..........................................................................................................................10

4.2 Factors Affecting Corrosion Rate............................................................................................................14

4.3 Forms of Corrosion .................................................................................................................................14

4.3.1 Concentration Cell Corrosion..................................................................................................................15

4.3.2 Pitting Corrosion .....................................................................................................................................16

4.3.3 Galvanic Corrosion .................................................................................................................................17

4.3.4 Stress Corrosion .....................................................................................................................................19

4.3.5 Intergranular Corrosion...........................................................................................................................20

4.3.6 Exfoliation Corrosion...............................................................................................................................23

4.3.7 Dezincification (Dealloying).....................................................................................................................23

4.3.8 Fretting Corrosion ...................................................................................................................................23

4.3.9 Corrosion Fatigue ...................................................................................................................................24

4.3.10 Cavitation-Corrosion ...............................................................................................................................25

5. Chapter 2—Design Considerations ........................................................................................................25

5.1 Introduction .............................................................................................................................................25

5.2 General Design Guide ............................................................................................................................25

5.2.1 Hood Assembly.......................................................................................................................................26

5.2.2 Fender Assembly ....................................................................................................................................27

5.2.3 Door Assembly........................................................................................................................................27

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J447™ APR2016

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摘要：

SAE J447-2016是国际自动机工程师学会（SAE）发布的关于车辆安全玻璃材料表面划伤及碎片飞溅性能的重要技术标准。该标准规定了用于机动车侧窗、后窗及天窗的强化与非强化玻璃在冲击后产生的碎片尺寸、分布及飞溅模式的具体测试方法和合格指标，旨在提升车辆在事故中对乘员的保护能力，减少二次伤害风险。文档涵盖了从玻璃预处理、冲击装置校准到碎屑分类统计的全流程操作指南，适用于汽车制造商、玻璃供应商及第三方检测机构进行产品合规验证。遵循SAE J447-2016可确保玻璃在破裂时形成细小钝边碎块而非尖锐

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SAE J447-2016

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