kata pengantar
ISO (Organisasi Internasional untuk Standardisasi) adalah aliansi global badan standar nasional (badan anggota ISO). Pengembangan standar internasional biasanya dilakukan melalui komite teknis ISO. Setiap lembaga anggota yang tertarik pada suatu mata pelajaran yang telah dibentuk komite teknisnya berhak untuk diwakili dalam komite tersebut. Organisasi pemerintah dan non-pemerintah internasional yang bekerja sama dengan ISO juga terlibat dalam pekerjaan ini. ISO bekerja sama dengan Komisi Elektroteknik Internasional (IEC) tentang semua masalah standardisasi elektroteknik.

Prosedur yang digunakan untuk mengembangkan dokumen ini dan yang digunakan untuk pemeliharaan lebih lanjut dijelaskan di Bagian 1 dari Petunjuk ISO/IEC. Secara khusus, perhatikan standar persetujuan berbeda yang diperlukan untuk berbagai jenis dokumen ISO. This document has been drafted in accordance with the editing rules in Part 2 dari Petunjuk ISO/IEC (lihat iso.org/directives).

Harap dicatat bahwa isi tertentu dari dokumen ini mungkin memiliki hak paten. ISO tidak bertanggung jawab untuk mengidentifikasi salah satu atau semua paten tersebut. Details of any patent rights identified during the preparation of the document will be in the introduction and/or list of patent claims received by ISO (lihat iso.org/patents).

Any trade names used in this document are information provided for the convenience of the user and do not constitute an endorsement.

Untuk penjelasan tentang arti istilah dan ekspresi ISO tertentu yang terkait dengan penilaian kesesuaian, and for information on ISO compliance with WTO principles in Technical Barriers to Trade (TBT), silakan merujuk ke URL berikut: Kata pengantar – Informasi tambahan

Komite yang bertanggung jawab atas dokumen ini adalah ISO/TC 156, Corrosion of Metals and Alloys.

ISO 18069-2015 “Korosi logam dan paduan — Metode untuk menentukan laju korosi yang seragam pada baja tahan karat dan paduan berbasis nikel dalam cairan”

memperkenalkan
Stainless steel and nickel-based alloys generally have good corrosion resistance, but uniform corrosion occurs in acidic and alkaline solutions. Uniform corrosion rates in aqueous solutions are generally considered to be a fairly stable process as long as the corrosive environment is constant in terms of chemical composition, suhu, and flow conditions. Karena itu, uniform corrosion resistance of stainless steel and nickel-based alloys is usually determined by short-term laboratory sample immersion tests conducted under controlled conditions. Namun, in practical applications, the conditions of service may change somewhat, which may result in temporary activation of the surface of stainless steel or nickel-based alloys. Changes in temperature, fluctuations in air or other oxidants, exposure to less valuable materials (such as mild steel) or certain cleaners are all factors that may lead to activation in some cases.

Karena itu, an important property to be studied is the ability of the material to passivate after activation, so the method includes activation of the sample. The corrosion rate determined by this test can be used as a basis for material selection and material life estimation.

1 jangkauan
This standard specifies the expected corrosion rate of uniform corrosion of stainless steel and nickel-based alloys in liquids and the ability of materials to passivate after activation.

The method is intended to be used to estimate uniform corrosion rates of liquids under atmospheric conditions, chemical industry under specific environmental conditions, and not as a qualification test. It can also be used to determine isoetch graphs and temperatures where corrosion rates exceed 0.1mm /a.

This standard does not apply to excessive corrosion rates exceeding 1 mm/a, as higher corrosion rates indicate that stainless steel is not suitable for application.

This standard does not apply to solutions containing halides, especially chlorides, which may cause localized corrosion.

2 Acuan normatif
All or part of the following documents are referred to normatively in this document and are not available for their use. Untuk referensi bertanggal, only the quoted version applies. Untuk referensi tidak bertanggal, the latest version of the reference applies.

ISO 3696, Air laboratorium analitik – spesifikasi dan metode pengujian

ISO 8044, Korosi logam dan paduan – Basic terms and definitions

ISO 17864, Korosi logam dan paduan – Determination of critical corrosion temperature under potentiostatic control

3 Istilah dan Definisi
Untuk keperluan dokumen ini, istilah dan definisi yang diberikan dalam ISO 8044 apply.

Hanya bagian informasi standar yang bersifat publik. Untuk melihat konten selengkapnya, Anda perlu membeli standar melalui saluran resmi.