المعنى والاستخدام
5.1 تم تطوير طريقة الاختبار في الأصل لأغراض البحث والتطوير; لكن, في مواصفات مواد محددة, it is referenced to evaluate production materials (انظر القسم 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. لكن, 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. على سبيل المثال, 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 طريقة اختبار التآكل الحراري الرطب الدوري

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

ملحوظة 1: This test method was originally developed for research and development purposes; لكن, في مواصفات مواد محددة, it is referred to as applicable for evaluating production materials (انظر القسم 14, “Accuracy and Deviation”).

1.2 This test method is applicable to all forged products, such as sheets, لوحات, 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 لا يهدف هذا المعيار إلى معالجة جميع المخاوف المتعلقة بالسلامة, لو اي, المرتبطة باستخدامه. تقع على عاتق مستخدمي هذه المواصفة القياسية مسؤولية تحديد السلامة المناسبة, الممارسات الصحية والبيئية وتحديد إمكانية تطبيق القيود التنظيمية قبل الاستخدام.

1.5 يعتمد هذا المعيار الدولي على مبادئ التقييس المعترف بها دوليًا المنصوص عليها في القرار المتعلق بمبادئ تطوير المعايير الدولية, المبادئ التوجيهية والتوصيات الصادرة عن لجنة منظمة التجارة العالمية المعنية بالحواجز الفنية أمام التجارة.