Значение и использование
5.1 Метод испытаний изначально был разработан для целей исследований и разработок.; Однако, в конкретных характеристиках материала, it is referenced to evaluate production materials (см. раздел 14 on accuracy and deviation).

5.2 Using this test method can effectively predict the spalling corrosion behavior of these alloys in various types of outdoor services, especially in Marine and industrial environments. The four-test solution is highly corrosive and represents a more stringent type of environmental service, and certainly does not include unusual chemicals that are unlikely to be encountered in the natural environment.

5.3 Exfoliation grades were chosen arbitrarily in this test to illustrate the wide range of resistance to exfoliation. Однако, it remains to be determined whether a correlation can be established between EXCO test ratings and the actual conditions of use for a given alloy. The Aluminium Alloy Peeling Corrosion Working Group (G01.05.02.08) is conducting an activity to conduct outdoor exposure testing for this purpose. Например, it has been reported that Al-Zn-Mg-Cu alloy samples rated EA or P in the 48-hour EXCO test did not experience more than a small amount of early peeling (EA) during six to nine years of exposure to the coastal atmosphere, while in most cases ED grade materials showed significant peeling within a year in the coastal atmosphere. It is expected that more comparisons will be provided as outdoor testing expands.

ASTM G34-2020 Метод испытаний на циклическую влажную тепловую коррозию

Радиус
1.1 This test method covers a constant immersion exfoliation corrosion (EXCO) test procedure for high strength 2XXX and 7XXX series aluminum alloys.

Примечание 1: This test method was originally developed for research and development purposes; Однако, в конкретных характеристиках материала, it is referred to as applicable for evaluating production materials (см. раздел 14, “Accuracy and Deviation”).

1.2 This test method is applicable to all forged products, such as sheets, тарелки, extrusions and forgings produced by conventional ingot metallurgy processes.

1.3 The test method can be used on any form of sample or part that can be immersed in the test solution.

1.4 Настоящий стандарт не предназначен для решения всех проблем безопасности., если таковые имеются, связанный с его использованием. Пользователи настоящего стандарта несут ответственность за установление соответствующей безопасности., практики в области здравоохранения и окружающей среды, а также для определения применимости нормативных ограничений перед использованием..

1.5 Этот международный стандарт основан на международно признанных принципах стандартизации, установленных в Решении о принципах разработки международных стандартов., Руководящие принципы и рекомендации, выпущенные Комитетом ВТО по техническим барьерам в торговле.