Astm b912 free download

NOTE 1Surface passivation occurs simultaneously with electropolish- ing under proper operating conditions. The quality of passivation will depend on the type of stainless steel, the formulation of the electropol- ishing solution, and the conditions of operation.

Free iron on the surface of the stainless steel is removed resulting in improved corrosion resis- tance. Surface smoothing obtained by electropolishing will also improve corrosion resistance. Electropolishing will also remove heat tint and oxide scale. No other units of measurement are included in this standard. This specication 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 deter- mine the applicability of regulatory limitations prior to use.

Referenced Documents 2. Terminology 3. Ordering Information 4. Current edition approved April 1, Published April Originally approved in Last previous edition approved in as B DOI: No further reproductions authorized. Unless otherwise specied by the purchaser, a bright luster shall be acceptable. Alternatively, samples showing the required nish, or range of nish, shall be supplied or approved by the purchaser.

When required, the basis material may be subjected, before electrop- olishing, to such mechanical polishing as may be required to yield the desired nal surface characteristics.

The location of electrical contact marks shall be agreed upon between purchaser and supplier. As much as 50 m may be removed for additional smoothing.

The ordering document shall include the maximum amount of metal to be removed. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent.

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Able Electropolishing meets the high standards of the American Society for Testing and Materials ASTMincluding those for stainless steel passivation using electropolishing. According to the ASTM, the electropolisher must include post-coating procedures as part of the process, as well as performance testing by means such as a salt spray test, a humidity test or a copper sulfate test.

The quality of passivation will depend on the type of stainless steel, the formulation of the electropolishing solution, and the conditions of operation. Because Able Electropolishing adheres to the ASTM B electropolishing guidelines for stainless steel passivation, our clients know what quality of work to expect when we process various types of stainless steels.

Standard ASTM B applies to pre-electropolishing cleaning and post-electropolishing coating such as a dip and rinse process. By maintaining tight control of our processing parameters, we are able to continue to meet the rigid guidelines of the ASTM, providing our clients not only with superior results in a timely fashion, but also peace of mind that their work is in good hands.

May 15 — 16, Boston, MA. AeroDef April 30 — May 1 Gain access to the technologies and people in aerospace astj defense manufacturing. Current edition approved Oct. Published January B 4. As much as 50 m may be removed for additional smoothing. The ordering document shall include the maximum amount of metal to be removed. Product Requirements 5. Test Procedures 6. Failure is indicated by the presence of red rust or staining as a result of the presence of free iron on the surface.

The article is swabbed with an acidified solution of copper sulfate. Failure is indicated by the presence of a copper-colored deposit or copper-colored spots, or both. This test is not to be used on martensitic series stainless steels.

The article is swabbed with a solution of potassium ferricyanide. Failure is indicated by the presence of a dark blue color within 30 s. NOTE 2Defects in the surface of the basis material such as scratches, porosity, inclusions, and so forth, may adversely affect the appearance and performance of the article. Visible examination shall include wearing correctional glasses if the inspector normally wears them.

NOTE 3A typical electropolishing solution and operating conditions suitable for many stainless steel alloys is shown in Appendix X1. Proprietary electropolishing solutions are available offering special features such as low sludging, better bright throwing power, longer life, or better performance with specific stainless steel alloys.

NOTE 4Intricately shaped articles may not receive the same degree of passivation in recessed area as a result of low-current densities. Increasing time or overall current density, or both, or the use of auxiliary cathodes, may be used to improve electropolishing in these areas and to pass subsequent passivation tests.

Sampling Requirements 7. The articles in the lot shall be inspected for conformance to the requirements of this specification and the lot shall be classified as conforming or not conforming to each requirement according to the criteria of the sampling plans in Test Method B The use of other mineral acids, such as sulfuric or hydrochloric acids, is not recommended as the passive film may be compromised.

Neutralization procedures such as immersion in alkaline solutions should not be used as they can have a tendency to set the residual film and detract from appearance and performance. Three are to be used when the test methods are nondestructive; that is, the test method does not make the articles nonconforming. The fourth plan is used when the test method is destructive. According to the ASTM, the electropolisher must include post-coating procedures as part of the process, as well as performance testing by means such as a salt spray test, a humidity test or a copper sulfate test.

These factors and others determine eligibility for meeting this specification. While passivation is useful for removing free iron and contaminants from stainless steel and is more well known, electropolishing is often a better option and can be used on far more metal alloys. This degree of precision and consistency, along with the ability to remove a variety of surface imperfections in one process, is why electropolishing is so often specified for critical parts used in medical implants and surgical instruments , aerospace components and fragile or critical parts used in other industries.

Electropolishing is a one-stop process for a micro-smooth, ultraclean, corrosion and pathogen-resistant surface finish — with 30 times more corrosion resistance than passivation. Electropolishing also eliminates the need for additional metal finishing processes like hand deburring, tumbling, pickling , and cleaning. Contact us to learn more about electropolishing. Our tightly controlled quality process and ISO and ISO certifications make us the preferred partner for many medical device manufacturers across the globe.