ASTM D4141/D4141M-14
涂层的黑箱和阳光集中暴露处理用标准操作规程

Standard Practice for Conducting Black Box and Solar Concentrating Exposures of Coatings

被代替

ASTM D4141/D4141M-14 发布历史

ASTM D4141/D4141M-14由美国材料与试验协会 US-ASTM 发布于 2014。

ASTM D4141/D4141M-14 在中国标准分类中归属于: A29 材料防护。

ASTM D4141/D4141M-14 涂层的黑箱和阳光集中暴露处理用标准操作规程的最新版本是哪一版？

最新版本是 ASTM D4141/D4141M-22 。

ASTM D4141/D4141M-14 发布之时，引用了标准

• ASTM D2244 用于计算彩色公差和色差与仪器测量颜色坐标的标准实践
• ASTM D4214 外用漆膜粉化程度评价的试验方法
• ASTM D523 稳定土壤用特定飞灰的标准操作规程
• ASTM D660 评定外部涂料检验等级的标准试验方法
• ASTM D661 评定外部涂料开裂程度的标准试验方法
• ASTM D662 评定外部涂料腐蚀程度的标准试验方法
• ASTM D7091 黑色金属用非磁性涂层和有色金属用非磁性非导电涂层干膜厚度的无损测量
• ASTM D714 油漆起泡等级评定的标准试验方法
• ASTM D772 外用漆片落(剥落)程度评估的标准试验方法
• ASTM D823 油漆、清漆及有关产品制成厚度均匀漆膜试片的标准实施规程
• ASTM G113 与非金属材料自然和人工风蚀试验相关的标准术语
• ASTM G141 非金属材料曝光测试中寻址易变性的标准导则
• ASTM G147 自然与人工老化试验用非金属材料的修整和维护标准规程
• ASTM G169 自然老化试验基本统计方法应用的标准指南*， 2024-05-06 更新
• ASTM G7 非金属材料的大气环境曝光试验
• ASTM G90 用集中自然阳光光线法加速实施对非金属材料的室外风蚀

* 在 ASTM D4141/D4141M-14 发布之后有更新，请注意新发布标准的变化。

ASTM D4141/D4141M-14的历代版本如下：

• 2022年 ASTM D4141/D4141M-22 涂料的黑匣子和太阳聚光曝光的标准实施规程
• 2014年 ASTM D4141/D4141M-14 涂层的黑箱和阳光集中暴露处理用标准操作规程
• 2007年 ASTM D4141-07 涂层的黑箱和阳光集中暴露处理用标准实施规程
• 2001年 ASTM D4141-01 进行涂层黑箱和阳光集中暴露试验的标准实施规程
• 1995年 ASTM D4141-95 进行涂层黑箱和阳光集中暴露试验的标准实施规程

 

5.1 As with any accelerated test, the increase in rate of weathering compared to in service exposure is material dependent. Therefore, no single acceleration factor can be used to relate two different types of outdoor weathering exposures. The weather resistance rankings of coatings provided by these two procedures may not agree when coatings differing in composition are compared. These two procedures should not be used interchangeably.

5.2 The procedures described in this practice are designed to provide greater degradation rates of coatings than those provided by fixed angle open-rack outdoor exposure racks. For many products, fixed angle exposures will produce higher degradation rates than the normal end use of the material.

5.2.1 The use of Procedure A (Black Box) instead of an open-rack direct exposure is a more realistic test for materials with higher temperature end use service conditions. For many coatings, this procedure provides greater rates of degradation than those provided by 5°, equator-facing, open-rack exposures because the black box produces higher specimen temperatures during irradiation by daylight and longer time of wetness. The black box specimen temperatures are comparable to those encountered on the hoods, roofs, and deck lids of automobiles parked in sunlight. The relative rates of gloss loss and color change produced in some automotive coatings by exposures in accordance with Procedure A are given in ASTM STP 781.4

5.2.2 The acceleration of Procedure C is produced by reflecting sunlight from ten mirrors onto an air-cooled specimen area. In the ultraviolet portion of the solar spectrum, approximately 1400 MJ/m2 of ultraviolet radiant exposure (295 to 385 nm) is received over a typical one-year period when these devices are operated in a central Arizona climate. This compares with approximately 333 MJ/m2 of ultraviolet radiant exposure from a central Arizona at-latitude exposure and 280 MJ/m2 of ultraviolet radiant exposure from a southern Florida at-latitude exposure over the same time period. However, the test described by Procedure C reflects only direct beam radiation onto test specimens. The reflected direct beam of sunlight contains a lower percentage of short wavelength ultraviolet radiation than global daylight because short wavelength ultraviolet is more easily scattered by the atmosphere, and because mirrors are typically less efficient at shorter ultraviolet wavelengths. Ultraviolet radiant exposure levels should not be used to compute acceleration factors since acceleration is material dependent.

5.3 The weather resistance of coatings in outdoor use can be very different depending on the geographic location of the exposure because of differences in ultraviolet (UV) radiation, time of wetness, temperature, pollutants, and other factors. Therefore, it cannot be assumed that results from one exposure in a single location will be useful for determining relative weather resistance in a different location. Exposures in several locations with different climates that represent a broad range of anticipated service conditions are recommended.

5.4 Because of year-to-year climatological variations, results from a single exposure test cannot be used to predict the absolute rate at which a material degrades.

Note 3—Several years of repeat exposures are typically needed to get an “average” test result for a g......

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标准号

ASTM D4141/D4141M-14

发布

2014年

发布单位

美国材料与试验协会

替代标准

ASTM D4141/D4141M-22

当前最新

ASTM D4141/D4141M-22

 

 

引用标准

ASTM D2244 ASTM D4214 ASTM D523 ASTM D660 ASTM D661 ASTM D662 ASTM D7091 ASTM D714 ASTM D772 ASTM D823 ASTM G113 ASTM G141 ASTM G147 ASTM G169 ASTM G7 ASTM G90

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