ASTM B Electroless Nickel Plating - Download as PDF File .pdf), Text File . txt) or read online. ASTM B Electroless Nickel Plating. Industrial Electroless Nickel Plating (MIL-C, AMS , ASTM B standards). Specifications Download Product PDF. Advanced Surface Technologies. ASTM B(), Type V. Electroless Nickel Low Phosphorus. MIL- CE, SAE-AMS F · ASTM B(), Type III. Electrolytic Nickel.
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Nov 29, Standard Speciﬁcation for Autocatalytic (Electroless) Nickel-Phosphorus Coatings on Metal 1 This standard is issued under the ﬁxed. (MIL-C, ASTM B, AMS ) Excellent corrosion resistance - dependent on phosphorous content hours per ASTM Download (PDF) . ASTM B Standard Specification for Autocatalytic (Electroless) Nickel- Phosphorus Coatings on Me_专业资料。ASTM B Standard Specification for.
A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope 1. Because the deposited nickel alloy is a catalyst for the reaction, the process is self-sustaining.
NOTE 7—The length of time to reach maximum hardness varies with the phosphorus content of the deposit. High phosphorus deposits may require longer time or a higher temperature, or both. Individual alloys should be tested for maximum hardness attainable, especially for conditions of lower temperatures and longer times. Do not use gas containing hydrogen with high-strength steel parts.
The location of rack or wire marks in the coating shall be agreed upon between the producer and purchaser. The use of a statistical regimen to establish the control limits and frequency of analysis may be employed to ensure quality deposits are produced. The tensile strength shall be supplied by the purchaser. Guide B contains a list of post treatments, procedures, limitations, and guidelines that are permitted to be used to reduce the effects of hydrogen embrittlement.
Requirements 7. Also, discoloration due to heat treatment shall not be cause for rejection unless special heat treatment atmosphere is speci? After coating and if speci? NOTE 9—The thickness of the coating cannot be controlled in blind or small diameter deep holes or where solution circulation is restricted.
The tests for these quali? The weight percent of phosphorus shall be in the range designated by type classi? For Class 2 coatings, the microhardness shall equal or exceed a minimum of HK or equivalent Vickers see 4.
The conversion of Vickers to Knoop using Tables E is not recommended. Sampling 8. Properly performed this will ensure coated products of satisfactory quality and will reduce the amount of acceptance inspection. NOTE 10—Usually, when a collection of coated parts the inspection lot 8. The inspection lot is then classi?
The size of the sample and the criteria of compliance are determined by the application of statistics. The procedure is known as sampling inspection. Three standards Test Method B , Guide B , and Test Method B contain sampling plans that are designed for the sampling inspection of coatings. Test Method B contains four sampling plans, three for use with tests that are nondestructive and one for use with tests that are destructive.
The purchaser and producer may agree on the plan s to be used. If they do not, Test Method B identi? Guide B provides a large number of plans and also gives guidance on the selection of a plan. When Guide B is speci?
Test Method B can be used only for coating requirements that have a numerical limit, such as coating thickness. The last must yield a numerical value and certain statistical requirements must be met.
Test Method B contains several plans and also gives instructions for calculating plans to meet special needs. An inspection lot shall be de?
NOTE 11—The autocatalytic nickel process is dynamic and a daily sampling is recommended. For coatings requiring alloy analysis and corrosion testing weekly sampling should be considered as an option. Test Methods 9. NOTE 12—Inductively coupled plasma techniques can determine the alloy to within 0.
The following analysis wavelength lines have been used with minimum interference to determine the alloy. Ni NOTE 14—To protect the edges, electroplate the specimens with a minimum of 5? The instrument shall be calibrated with deposits plated in the same solution under the same conditions on magnetic steel.
The instrument must be calibrated with standards having the same composition as the coating. Make sure that the surfaces measured are smooth, clean, and dry.
The surface of the coating shall be cleaned prior to testing see Note NOTE 16—This method is only recommended for deposits in the as-plated condition. The phosphorus content of the coating must be known to calculate the thickness of the deposit. Matrix effect due to the distribution of phosphorus in layers of the coating also effect the measurement accuracy and require that calibration standards be made under the same conditions as the production process.
When required, one of the following tests can be used on the plated part or specimen. After rinsing and air drying, examine the part for blue spots, which form at pore sites.
Apply heat to the beaker at such a rate that the water begins to boil in not less than 15 min, nor more than 20 min after the initial application of heat.
Continue to boil the water for 30 min. Then remove the part, air dry, and examine for rust spots, which indicate pores. NOTE 19—Aerated water is prepared by bubbling clean compressed air through distilled water by means of a glass diffusion disk at room temperature for 12 h. The pH of the aerated water should be 6. Fine cracks in the coating on the tension side of the bend are not an indication of poor adhesion.
Insertion of a sharp probe at the interface of the coating and basis metal to determine the adhesion is suggested. NOTE 17—Appropriate test specimens are strips approximately 25 to 50 mm wide, to mm long and 3 to 6 mm thick. Make three closely spaced indentations and examine under magni? The coating is examined for blistering or other evidence of poor adhesion at 43 magni?
It will vary depending on loads, type of indenter, and operator. A g load is recommended. The rhombic Knoop indenter gives higher hardness readings than the square-base pyramidal Vickers diamond indenter for to g loads, see Ref 6. For maximum accuracy, a minimum coating thickness of 75? Conversions of Vickers or Knoop hardness number to Rockwell C is not recommended.
NOTE 18—On thick 75? After 3 min contact, rinse, and apply a solution of alizarin sulfonate prepared by dissolving 1. After 4 min contact, apply glacial acetic acid until the violet color disappears. Any red spots remaining indicate pores. After 3 min, apply a solution of potassium ferrocyanide prepared by dissolving 1 g of potassium ferrocyanide and 1.
The appearance of brown spots after 2 min indicate pores. The precision and bias requirements will vary for each type of test. If an alternate test is speci? Rejection and Rehearing Rejection shall be reported to the producer promptly in writing.
In the case of dissatisfaction occurs with the results of a test, the producer may make a claim for a hearing. Coatings that show imperfections may be rejected.
Keywords Use the test methods described in 9. The coating shall meet a maximum wear rate which is speci? The wear rate shall be speci? The corrosion resistance of the coating to a speci? The test is performed by rotating a plated panel under rotating rubber wheels and weighing the panel after each cycles for weight loss.
Duration of the test is cycles and it can be extended to 25 cycles for more complete results. NOTE X1. Care should be taken to control the humidity between tests.
For each of the three specimens complete the following steps: X1. The wheels shall be loaded with g with a vacuum on high for the entire test. High phosphorus deposits may require longer time or a higher rempcrarure, or both.
Individual alloys should be tested for rnaxinum hardness attainable, especially for conditions o f lower temperarures and longer timcs. NOTE 8-Inerr or rcducing atmosphere or Wacuum rufficienrto prevent oxidation is recamrnendzd for hear treatment above C. Da not usegas containing hydrogen u,ith high-srrength steel parts.
Requirements 7. Also, discoloration due to heat treatment shall not be cause for rejection unless special heat treatment atmosphere is spccificd see section 5.
T i e test method. Tlie tests for these qualification requiremelits shall be performed monthly or more frequently. Tlie conversion of Vickers to h o o p using Tables E is not recommetided. Sampling 8. Properly perfomled this will ensure coated products of satisfactory quality and will reduce the amount of acceptance inspection. NOTE Usually. Three standards Test Method B Guide B Tesr Method B conrains four sampling plans, three far use with tests thal are nondestructive and one for use w!