SAE J2792-2015

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suggestions.

recording, or otherwise, without the prior written permission of SAE.

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http://www.sae.org/technical/standards/J2792_201509

SURFACE VEHICLE

RECOMMENDED PRACTICE

J2792™

SEP2015

Issued 2008-11

Stabilized 2015-09

Superseding J2792 NOV2008

Test Methodology for Evaluating the Chemical Compatibility of

Wheel Finishes with Various Chemicals

RATIONALE

The technical report covers technology, products, or processes which are mature and not likely to change in the foreseeable

future.

STABILIZED NOTICE

This document has been declared "Stabilized" by the SAE Wheel Standards Committee 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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SAE INTERNATIONAL J2792™ SEP2015 Page 2 of 8

TABLE OF CONTENTS

1. SCOPE .......................................................................................................................................................... 2

1.1 Purpose ......................................................................................................................................................... 2

2. REFERENCES .............................................................................................................................................. 2

2.1 Applicable Publications ................................................................................................................................. 2

2.1.1 SAE Publication ............................................................................................................................................ 3

2.1.2 ASTM Publications ........................................................................................................................................ 3

3. TEST PROCEDURE ..................................................................................................................................... 3

3.1 Test Materials and Equipment ...................................................................................................................... 3

3.2 Exposure ....................................................................................................................................................... 3

3.3 Atmospheres to Accelerate or to Advance the Reactions of the Cleaning Solutions ................................... 4

3.4 Repeat Steps to Customize the Procedure per Decision Tree ..................................................................... 4

3.5 Optional Atmospheres for Accelerating the Reactions ................................................................................. 5

3.6 Evaluation Methods ....................................................................................................................................... 5

3.7 Test Products ................................................................................................................................................ 5

4. NOTES .......................................................................................................................................................... 8

4.1 Marginal Indicia ............................................................................................................................................. 8

FIGURE 1 EXAMPLE “DECISION TREE” FOR EVALUATING THE COMPATIBILITY OF VARIOUS

TIRE OR WHEEL CLEANERS WITH A CHROME PLATED WHEEL FINISH ............................................. 6

FIGURE 2 EXAMPLE “DECISION TREE” FOR DETERMINING THE MAXIMUM CONCENTRATION

OF A PRODUCT THAT WOULD BE COMPATIBLE FOR CLEANING WHEELS WITH

VARIOUS FINISHES .................................................................................................................................... 7

1. SCOPE

This document proposes methods for the testing and evaluation of aluminum wheel and wheel trim surface finishes for

compatibility with various types of tire, wheel and car wash cleaning materials, and other chemicals that might come into

contact with these automotive components. It is recognized that each end user of this methodology might seek answers to

questions that are unique to his business or situation. Therefore, the procedure is written in a generic sequence that could

be strictly followed, repeated, or modified in order to provide the user with the best results. Example decision tree are

provided to help the user select a sequence of exposure steps that would best suit his needs, (reference Figures 1, 2).

This procedure should not be utilized if the intent is to evaluate the compatibility of wheel finishes to any flammable products,

because those chemistries would require special laboratory safety and handling precautions.

1.1 Purpose

The purpose is to standardize the process and methods for assessing the compatibility of chemicals with wheels and wheel

trim used on passenger vehicles.

2. REFERENCES

2.1 Applicable Publications

The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the

latest version of SAE publications shall apply.

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SAE INTERNATIONAL J2792™ SEP2015 Page 3 of 8

2.1.1 SAE Publication

Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA

and Canada) or 724-776-4970 (outside USA), www.sae.org.

SAE J2633 Wheel and Wheel Trim Weathering Testing for Paint Coatings

2.1.2 ASTM Publications

Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.

ASTM D1735 Standard Practice for Testing Water Resistance of Coatings Using Water Fog

ASTM D 1193 Standard Specification for Reagent Water

3. TEST PROCEDURE

3.1 Test Materials and Equipment

Various liquid tire, wheel, chrome, and whitewall cleaners, as well as other car wash solutions, that can be found in the

geographic areas of interest. Various concentrations of ingredients could be evaluated with this procedure. Each test and

each test cycle should be initiated with new chemical solutions.

3.1.1 Containers such as polyethylene bottles should be procured to hold the coated panels and the test solutions. These

containers must be inert to acids, caustics and petroleum products that could be in the cleaning solutions. The

operator should utilize the Material Safety Data Sheets, (MSDS) of each product to determine if the bottles selected

for the test will be inert for the test procedure. Make sure that the containers will not be degraded by the solutions

prior to container selection. Assure that the containers will be of adequate size to accommodate your test samples

and solutions, and for your special handling needs.

3.1.2 While any geometry of sample could be utilized, the recommended sample configuration would be a wrought or

cast aluminum or steel panel with the appropriate cleaning, pretreatment, and coating that would simulate

production for that candidate finish. The baseline appearance, hardness, and other properties of the panel should

be established prior to engaging in a matrix of testing. The baseline properties could be used to determine if there

were changes as a result of being exposed to the solutions. Consult with the coating manufacturer to determine

the baseline characteristics of the finish.

3.1.3 Finishes that are to be evaluated on the panels should be applied with production-intent cures and thicknesses.

Studies could also include minimum and maximum cures and thicknesses. All new coatings should be evaluated

in parallel with a currently approved production material, or with a “Dummy panel” with a finish that undergoes the

cycles of time and temperature but in a neutral solution, such as water.

3.1.4 The chemistry of the cleaner media should be documented prior to initiation of the procedure to establish the

baseline chemistry. The end-of-test cleaner could be compared to the baseline chemistry. Changes might indicate

a breakdown in the panel finish.

3.2 Exposure

3.2.1 Document all production intent data relative to coating thickness, cure, and process conditions, finish quality, test

media chemistry, etc. After the panels have been coated, allow 72 h `age’ before engaging in the next step of the

procedure. This is common practice for painted panels to assure that the cross linking has proceeded to a

normalized degree of cure.

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摘要：

SAE J2792-2015 是国际自动机工程师学会（SAE International）发布的关于氢燃料车辆加注通信协议的标准规范，主要定义了在氢气加注过程中，车辆与加氢站之间进行数据交换的技术要求与接口准则。该标准于2015年修订发布，旨在确保氢燃料电池汽车在加注氢气时实现安全、兼容与高效的通信控制，涵盖压力、温度、流量及加注状态等关键参数的实时传输。对于从事氢能源基础设施、燃料电池汽车开发及加氢站建设的企业与工程师而言，SAE J2792-2015是保障加注互操作性与安全性的核心技术文件，

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