|参数||GMW15919||Ford BI 107-05||LP-463PB-64-01 |
|动态压力||目标值37.9Kpa（5.5Psi） ||目标值37.9Kpa（5.5Psi） ||目标值37.9Kpa（5.5Psi） |
|喷嘴直径||12.25 to 12.75mm||12.25 to 12.75mm||12.25 to 12.75mm|
THERMAL SHOCK PROCEDURE FOR ORGANIC COATING ADHESION TEST
Test procedure is designed to evaluate the adhesion of organic coatings.
The purpose of this procedure is to determine the resistance to degradation and/or adhesion loss over steel, aluminum, plastic or other substrates coated with organic finishes while subjected to thermal changes and high pressure spray conditions. These conditions are similar to those generated by the heated pressure wash equipment found in manual car wash operations. Evaluation is based on a pass/fail analysis.
1.2 Coverage of this Standard
This test procedure may be used to evaluate organic finishes over metal or plastic substrates with
appropriate surface preparation (plating, chemical surface treatment, etc). This test procedure can be used for interior, exterior, and underhood/underbody applications.
2.0 SPECIAL TEST EQUIPMENT & MATERIALS
|TABLE 1: SPECIAL TEST EQUIPMENT |
|Name Of Item ||Description ||Make/Model |
|Scribe Tool |
|Straight shank tungsten carbide |
tipped scribe device with a tip angle
of 60 15 degrees or equivalent.
|Razor knife ||Common utility knife or X-acto knife ||N.A. |
|Water Bath |
|Capable of maintaining 38 +/- 2° C |
|Freezer||Capable of maintaining -29 +/- 2° C N||N.A. |
|Discharge Nozzle: 12.5 mm ID (100 |
mm minimum length)
Dynamic Head Pressure: 37.9 +/- 2
kPa (5.5 psi) +/- 5% deviation
|Model 100 Steam |
Generator from Atomic Steam
Co., 10727 Fendell, Detroit, MI
48238 or equivalent.
3.0 SUMMARY OF METHOD
This procedure will evaluate organic coating adhesion after exposure to elevated and reduced
temperatures using high pressure steam impingement.
4.0 SAFETY PRECAUTIONS
This test procedure involves high and low temperature conditions, steam, and high pressure spray.
Pressurized steam represents a potential burn hazard. Parts must be secured properly to the test fixture and laboratory technicians should wear full face shields and heat resistant gloves. If possible, the testing should be conducted in a test chamber equipped with a full closing front shield with safety interlock to prevent triggering steam with the shield open. This standard does not address all the safety problems associated with its use. It is the responsibility of whomever uses this standard to consult and establish appropriate safety and health practices to determine the applicability of regulatory limitations prior to use.
Condition fully cured parts or panels for a minimum of 72 hours at 23 +/- 2°C and 50 +/- 10% relative humidity prior to beginning test procedure.
A. Immerse test specimen in an aerated water bath at 38 2°C for 4 hours. Water should contain max 5 ppm dissolved solids as sodium chloride (NaCl).
将试样浸入38 2°C的充气水浴中4小时。水应含有最多5 ppm的溶解固体，如氯化钠（NaCl）。
B. Immediately after removal from water bath, scribe parts or panels through to the substrate as shown in Figure 1.
- Hard substrates such as metal or rigid plastic should use a carbide tipped scribe tool.金属或硬塑料等硬基片应使用硬质合金尖划线工具
- Elastomeric substrates should be scribed with a razor knife. 应使用剃须刀划出弹性基底。
- Place parts or panels into freezer held at -29±2°C for a period of minimum 3 hours. 将零件或面板放置在-29 ±2°C的冰箱中至少3小时。
- Verify that steam generation equipment is functioning at a flow rate or 2.7 L/minute and dynamic head pressure of 37.9 kPa (5.5 psi) as detailed in the equipment section of this document. See Appendix A showing a suitable device for measuring dynamic head pressure. 验证蒸汽发生设备在流量或2.7 L/min和动态压头压力为37.9 kPa（5.5 psi）的情况下运行，如本文件设备部分所述。见附录A，其中显示了测量动态压头压力的合适装置。
E. Adjust test part or panel holding fixture and nozzle to provide the necessary 45° angle of impingement and the 50-75 mm nozzle to part distance required for testing.
NOTE: Steam impingement force requires that the part or panel be held tightly to prevent shifting during the test. Adjustable clamps are used to provide both necessary holding strength and part
F. Remove part or panel from freezer and immediately mount in the holding fixture ensuring that the nozzle is directed at the center of the “X” scribe. See Appendix B.
G. Begin 30 second steam impingement within 30 seconds of removal from the freezer.
NOTE: Pressurized steam represents a potential burn hazard. Parts must be secured properly to the test fixture and laboratory technicians should wear full face shields and heat resistant gloves. If possible, the testing should be conducted in a test chamber equipped with a full closing front
shield with a safety interlock to prevent triggering steam with the shield open.
- After 30 second test is complete, evaluate the test part for change in appearance or adhesion loss. 30秒试验完成后，评估试验零件的外观变化或附着力损失。
Record any changes in visual appearance such as cracking, whitening, blushing or discoloration, or loss of gloss.
If adhesion loss occurs, record the area of removal in cm2. Adhesion loss of < 0.5 cm2 is acceptable.
psi: pounds per square inch
9.0 GENERAL INFORMATION
Three asterisks “***” after the section/paragraph header denotes single or multiple technical changes to the section/paragraph. Specific technical changes within a section, subsection, table, or figure may be highlighted in yellow.
Certain important information relative to this Laboratory Procedure has been included in separate
standards. To assure the materials submitted meet all of Chrysler requirements, it is mandatory that the requirements in the following standards be met.
CS-9800 - Application of this procedure, the subscription service, and approved sources
CS-9003 - Regulated substances and recyclability
For specific information on this document, please refer to the contact person shown in the "Publication Information" Section of this document. For general information on obtaining Engineering Standards and Laboratory Procedures, see CS-9800 or contact the Engineering Standards Department at LP-463PB-64-01, Change -, 2011-05-09, Page 3