ASTM B Standard Guide for Post-Coating Treatments of Steel for Reducing the Risk of Hydrogen Embrittlement. ASTM B Standard Guide for Post-Coating Treatments of Steel for Reducing_ 化学_自然科学_专业资料。后电镀产品处理,降低氢脆的风险标准. Buy ASTM B R GUIDE FOR POST-COATING TREATMENTS STEEL FOR REDUCING THE RISK OF HYDROGEN.
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This heat-treatment procedure shall be used after plating operations but prior to any secondary conversion coating operation. NOTE 2—The treatment class selected is based on experience with asym part, or similar parts, and the speci? The hydrogen can be introduced during cleaning, pickling, phosphating, electroplating, autocatalytic processes, porcelain enameling, and in the service environment as a result of cathodic protection reactions or corrosion reactions.
This heat-treatment procedure shall b80 used after plating operations but prior to any secondary conversion coating operation.
Which of these would be performed first? Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Ast, the selection of electroplating solutions with high cathodic efficiencies is recommended for 2. So, generally it is hydrogen embrittlement relief bake first and heat treatment second.
Except for surface-hardened and shot-peened parts, the choice of embrittlement-relief heat treatment and the corresponding treatment conditions shall be selected on the basis of actual tensile strength of the steel.
ASTM B850 – 98(2015)
This phenomenon often occurs in alloys that show no signi? B — 98 ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Thanks for your help. Some companies consider the high temperature bake as sufficient to replace the hydrogen embrittlement relief if it can be done within 4 hours, but you would need to check with your customer first before going down that route.
While the crystallized chromate coating will provide satisfactory corrosion protection under most natural environments, the chromate coating will no longer pass accelerated corrosion tests. Originally approved in If I am coating primarily for corrosion protection, I can select a class 3 post heat treatment to improve adhesion and to provide for hydrogen embrittlement relief. Embrittlement Relief Treatment Classes 5.
This guide covers the standard procedure of performing post-coating heat treatment of some steels for reducing susceptibility to hydrogen embrittlement or degradation that may arise in the finishing processes.
The heat treatment does not guarantee complete freedom from the adverse effects of hydrogen degradation. For cadmium, tin, zinc, their alloys, or any other coating receiving astj chromate treatment, heat treatment shall be conducted before chromate treatment.
ASTM B Class 3 post heat treatment vs. ASTM B embrittlement relief
Guide ASTM B is a better document to use as a guide to the minimum times for de-embrittlement operations, especially true when you get up the the high tensile strength or very hard materials. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.
ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
Hi Richard, If the high temperature treatment cannot be done within a reasonable time at least within 4 hours of plating then the embrittlement relief bake needs to be done first.
Class ER-0 treatment is therefore provided for parts that the purchaser wishes to exempt from treatment. Historical Version s – view previous versions of standard. It is recommended that the tensile strength be supplied by the purchaser. Does specifying embrittlement relief baking per Guide B replace Class 3 post heat treatment or should it be specified in addition to Class 3 post heat treatment?
Heat Treatment After Processing 6. This abstract is a brief summary of the referenced standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
This heat treatment procedure shall be used after plating operations but prior to any secondary conversion coating operation. A number in parentheses indicates the year of last reapproval.
No further reproductions authorized. No other units of measurement are included in this standard. From beautiful Pine Beach New Jersey: All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
NOTE 3—The use of inhibitors in acid pickling baths may not minimize hydrogen embrittlement. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.
They do not apply to any other standard. Because of factors such as alloy composition and structure, type of coating, coating thickness, size, mass, or design parameters, some parts may perform satisfactorily with no embrittlement-relief treatment. NOTE 5—The time period referred to asgm the length of time between the end of the plating operation and loading of the item concerned into the heat treatment processor.
What is the answer to the Heat Treatment vs. February 24, — apologies, finishing. Per B paragraph 6. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
ASTM B Standard Guide for Post-Coating Treatments of Steel for Reducing_百度文库
A superscript epsilon e indicates an editorial change since the last revision or reapproval. I figure that if I ask a plater to plate a part per a specification, the least I can do is read the specification and give them all of the ordering information they need to plate our parts per the specification. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
If you feel that your comments have not received a satm hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. For steels of actual tensile strength below MPa, heat treatment after plating is not essential.
It is the responsibility of the user of b8500 standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Current edition approved April 1, Hi Richard, Bit of an odd one this. When only the minimum tensile strength is speci?