航空航天原材料说明书
AMS 2649C
发布    1987年7月
修订    2008年7月
取代    AMS 2649B
Etch Inspection of High Strength Steel Parts
高强度钢零件的烧伤检查
RATIONALE
综述
This revision was issued to add requirements for examination of carburized surfaces and to remove requirements for （1) blasting or abrading to prepare the parts and (2) approval of the anti—smut chemical.  Other changes were deemed necessary as part of the SAE Five Year Review process.
这次改版增加了检查渗碳表面的要求，并去除了（1）喷砂或研磨零件的预处理要求以及（2)
防污化学物的批准要求.其他的变化是SAE五年评审程序的必要更改。
1.SCOPE
范围
1。1 Purpose
目的
This specification establishes the requirements for etch inspection of bare high-strength low-alloy steel parts having tensile strength of 180 ksi (1241 MPa) and higher and of carburized parts to detect overheating caused by abusive machining or grinding in the heat treated condition, and to detect localized discontinuous carburization. This process is not applicable to surface hardened steels produced by nitriding or carbonitriding. This process may remove 0.0001 to 0.0005 inch (2。5 to 12。7 micrometers) from the surface of the part。
本规范规定了拉伸强度不低于180 ksi（1241 MPa)的高强度低合金裸钢零件和渗碳零件的烧伤检查，以检查材料在热处理状态中加工和磨削不当造成的过热,以及局部不连续渗碳。本工艺不适用于由氮化或氰化产生的表面硬化钢.本处理过程可能去除零件表面0。0001- 0。0005英寸(2。5— 12.7微米）的厚度。
1.2 Classification
类型
Etchants used in this specification are classified as follows:
Type 1 - Nitric acid in water or alcohol with an anti—smut additive
Type 2 — Nitric acid in water or alcohol
Type 3 — Ammonium persulfate in water
本规范中使用的腐蚀剂分类如下：
第1类-—水或酒精中加硝酸，并混合防污添加剂
第２类——水或酒精中加硝酸
第３类—-水中加过硫酸铵
1.2。1 Type 1 and Type 2 etchants may be used interchangeably。 Type 1 immersion or Type 3 swabbing method shall be used when the part cannot be hydrogen embrittlement relieved.
第1类和第2类腐蚀剂可以互换使用。当零件无法去氢脆时，应该使用第1类浸泡法或第３类擦抹法。
1。2.2 Type 3 etchant shall be applied by swabbing and only used when authorized by the cognizant engineering organization.Type 3 is not as sensitive for detecting grinding burns as Type 1 or Type 2.
只有得到授权的工程组织批准后,才能使用第3类腐蚀剂擦抹的方法。第３类腐蚀剂没有第1类和２类腐蚀剂检查磨削烧伤的灵敏度高。
1.3 Safety - Hazardous Materials
安全——危险物品
While the materials， methods， applications， and processes described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards that may be involved in such use.  It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved.
本规格中描述或引用的材料、方法、用途和工艺可能涉及到危险物品的使用，但本规范没有说明这些使用的危险性.使用者自行负责熟悉安全和正确使用所有危险物品，并且采取必要的预防措施，确保所有有关人员的健康和安全。
The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein。 The processor may work to a subs
equent revision of a document unless a specific document issue is specified。 When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply。
在订单之日现行有效的以下文件版本，在这里规定的范围内成为本规范的一部分。除非规定使用某特定版本，操作者应根据文件后续修订版本进行操作。若引用文件被取消且未规定替代规范，则应使用该规范的最新出版版本。
2。1 SAE Publications
SAE出版物：
Available from SAE International， 400 Commonwealth Drive, Warrendale， PA 15096—0001, Tel： 877-606-7323 （inside USA and Canada) or 724-776—4970 （outside USA)， www。.
可联系以下方式获取:ASE， 400 Commonwealth Drive， Warrendale, PA 15096-00019(邮编），电话：877-606—7323 （美国和加拿大境内） 或者724—776—4970 （美国)或
访问该网址www.sae。org。
A MS 2759/9 Hydrogen Embrittlement Relief （Baking） of Steel Parts
AMS 2759/9 钢制零件去氢脆(烘烤）
ARP1923 Qualification and Certification of Etch Inspectors
ARP1923 烧伤检验人员的评定和认证
2。2 U.S。 Government Publications 
政府出版物
Available from DODSSP， Subscription Services Desk, Building 4D， 700 Robbins Avenue, Philadelphia， PA 19111-5094 orswabbing www。dsp.dla。mil.
可联系以下方式获取：DODSSP， Subscription Services Desk， Building 4D, 700 Robbins Avenue， Philadelphia, PA 19111—5094（邮编），或访问该网址www.sae。org。
MIL—PRF—16173 Corrosion Preventive Compound, Solvent Cutback， Cold-Application
MIL-PRF—16173 冷用溶剂稀释型防锈混合物
MIL-PRF-32033 Lubrication Oil， General Purpose， Preservative (Water—Displacing， Low Temperature)
MIL—PRF—32033 通用防锈润滑油（水驱，低温）
3. TECHNICAL REQUIREMENTS
技术要求
3。1 Preparation
准备
3.1。1 Parts to be etch inspected shall be cleaned to remove contaminants that will prevent wetting of the etching solution. The part to be etched shall have a water—break-fre
e surface when held vertically for 30 seconds。 Cleaned parts shall not be touched with bare hands prior to inspection。
待烧伤检查的零件应该清洁，除去会妨碍腐蚀溶液润湿零件的污染物。将把待烧伤的零件竖直立放30秒，零件应该有一层水膜不破表面。在检查之前，清洁的零件不应该直接用手接触。
3.1。2 Surface activation shall be performed as follows:
3。1。2表面活化应该按照如下步骤操作：
3。1。2.1 When blasting is performed, aluminum oxide or silicon carbide media shall be used to produce a matte appearance。 Parts that can be damaged by blasting or may trap the blasting media shall not be cleaned by blasting。