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AMS 2700C-2008

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AMS 2700C-2008

SAE - J 1349-2008_材料科学_工程科技_专业资料。此文章为美标最新,豆丁售价5块
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Passivation of corrossion resistant steels

This document was revised to incorporate the essential requirements of AMS-QQ-P-35. 1. SCOPE 1.1 Purpose This specification covers the requirements for a process to assure removal of free iron or other less noble contaminants from the surfaces of corrosion resistant steel parts. 1.2 Application The processes defined in this specification have been used typically to dissolve tramp metallic elements from the surfaces of corrosion resistant steels to improve their corrosion resistance, but usage is not limited to such applications. 1.3 Classification 1.3.1 Methods Passivation methods covered by this specification are as follows: Method 1 - Passivation in Nitric Acid Method 2 - Passivation in Citric Acid Method 1 shall be used unless Method 2 is authorized by the cognizant engineering organization. 1.3.2 Types The following types may be specified for Method 1: Type 1 Low Temperature Nitric Acid with Sodium Dichromate Type 2 Medium Temperature Nitric Acid with Sodium Dichromate Type 3 High Temperature Nitric Acid with Sodium Dichromate Type 4 40% Nitric Acid for Free Machining Steels Type 5 Anodic, for High Carbon Martensitic Steels Type 6 Low Temperature Nitric Acid Type 7 Medium Temperature Nitric Acid Type 8 Medium Temperature, High Nitric Acid Concentration Where no type is specified, the processor may use any of the listed types that meet the requirements given herein

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