1.1本试验方法包括加速暴露试验，旨在模拟佛罗里达州杰克逊维尔暴露现场酸雨引起的汽车透明涂层缺陷。佛罗里达州杰克逊维尔的酸雨测试点的外部暴露会产生从小凹坑到12.7毫米（0.5英寸）不等的蚀刻缺陷直径或更大的酸蚀斑点。在其他仅产生小于6.35 mm（0.25 in.）的凹坑的酸蚀试验中，不会产生后一种类型的缺陷直径。 注1 在室外酸雨暴露和本试验方法中描述的加速试验中产生的酸蚀缺陷的数字图像见附录X1。 1.2本试验方法中所述的加速试验使用符合实施规程G 155要求的带日光滤光片的氙弧光源。用模拟酸雨溶液喷涂试样，并需要使用水平、平坦的试样阵列，以使酸雨溶液在试样上保持较长时间。 1.3本试验方法没有已知的ISO等效物。 1.4以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.5本标准无意解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 酸蚀损坏是汽车公司的一项重要保修索赔项目。因此，耐酸蚀性是汽车外部涂层的一个重要参数。本试验方法中描述的方法已被证明可模拟佛罗里达州杰克逊维尔市5月至8月中旬暴露的汽车透明涂层的酸蚀损伤。 3. , 5. 本标准中所述的加速试验允许全年试验，而不是佛罗里达州杰克逊维尔的有限室外暴露时间。

1.1 This test method covers an accelerated exposure test intended to simulate defects in automotive clearcoats caused by acid rain that occur at the Jacksonville, Florida exposure site. Exterior exposures at an acid rain test location in Jacksonville, Florida produce etch defects that range from small pits to 12.7 mm (0.5 in.) in diameter or larger acid-etched spots. The latter type of defect is not produced in other acid-etch tests that only produce pits that are smaller than 6.35 mm (0.25 in.) in diameter. Note 1 Digital images of the acid etch defects produced in outdoor acid-rain exposures and in the accelerated test described in this test method are found in Appendix X1. 1.2 The accelerated test described in this test method uses a xenon-arc light source with daylight filter conforming to the requirements of Practice G 155. Specimens are sprayed with a simulated acid rain solution and requires the use of a horizontal, flat specimen array in order to allow the acid rain solution to remain on the test specimens for an extended period of time. 1.3 There is no known ISO equivalent to this test method. 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== Acid etch damage is an important warranty claim item for automotive companies. As a result, acid etch resistance is an important parameter for automotive exterior coatings. The method described in this test method has been shown to simulate acid etch damage of automotive clearcoats that occurs when such coatings are exposed from May through mid-August in Jacksonville, FL. 3 , 5 The accelerated test described in this standard allows year-round testing as opposed to the limited outdoor exposure time available for the Jacksonville, FL exposures.