ASTM B733-97 PDF
ASTM B Standard Specification for Autocatalytic (Electroless) Nickel- Phosphorus Coatings on Metal. This specification covers requirements for. A S T M BENGL W Ob T A U 4Tb – m AMERICAN origioauy published as B direct responsibility of Subcommittee B Advanced Plating Technologies, a Milwaukee, Wisconsin company, provides electroless nickel plating per MIL-C, ASTM B and AMS as well as.
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ASTM B Specification | Electroless Nickel – Phosphorous Coatings | General Metal Finishing
You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. The purchaser and producer may agree on the plan s to be used. This standard is not included in any packages. The chemical makeup of the plating solution and the use of the solution can affect the porosity and corrosion resistance of the deposit.
The test is performed by rotating a plated panel under rotating rubber wheels and weighing the panel after each cycles for weight loss. The chemical and physical properties of the deposit vary primarily with its phosphorus content and subsequent heat treatment. NOTE 10—Usually, when a collection of coated parts the inspection lot 8.
High phosphorus deposits may require longer time or a higher temperature, or both. This standard has been approved for use by agencies of the Department of Defense. If the document is revised or amended, you will be notified by email.
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. For each of the three specimens complete the following steps: The weight percent of phosphorus shall be in the range designated asstm type classication see 4.
The instrument must be calibrated with standards having the same composition as the coating. A suitable method shall activate the surface and remove oxide and foreign materials, which may cause poor adhesion and coating porosity. 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 asstm as the production process.
In all cases, the duration of the heat treatment shall commence from the time at which the whole of each part attains the specied temperature.
For Class 2 coatings, the microhardness shall equal or exceed a minimum of HK or equivalent Vickers see 4. The tests for these qualication requirements shall be performed awtm or more frequently. If an alternate test is specied it shall be agreed upon between the producer and the purchaser.
A g load is recommended. NOTE 4—The purchaser should furnish separate test specimens or coupons of the basis metal b7333-97 test purposes to be plated concurrently with the articles to be plated see 8. The appearance of brown spots after 2 min indicate pores. Make three closely spaced indentations and examine under magnication for aking or blistering of the wstm, which is cause for rejection.
Coatings that b733–97 imperfections may ashm rejected. Typical environments include light-load lubricated wear, indoor corrosion protection to prevent rusting, and for soldering and mild abrasive wear.
The producer shall not be responsible for coatings defects resulting from surface conditions of the metal, if these conditions have been brought to the attention of the purchaser. After coating and if specied, the part shall not exceed maximum dimension on signicant surface see section 5. The last must yield a numerical value and certain statistical requirements must be met.
Coatings with phosphorus contents greater than Test specimens are available from Taber. B — 97 Standard Specication for Autocatalytic Electroless Nickel-Phosphorus Coatings on Metal 1 This standard is issued under the xed designation B ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the asgm of last revision.
We have no amendments or corrections for this standard. Then remove the part, air dry, and examine for rust spots, which indicate pores. Avoid rapid heating and cooling of plated parts.
They are used on beryllium and titanium parts for low stress properties. NOTE 9—The thickness of the coating cannot be controlled in blind or small diameter deep holes asmt where solution circulation is restricted. After 4 min contact, apply glacial acetic acid until the violet color disappears.
The corrosion resistance of the coating to a specic liquid medium can be determined by means of immersion zstm see Practice G 31 or electrochemical test see Practices G 5 and G After rinsing and air drying, examine the part for blue spots, which form at pore sites.
Use the test methods described in 9.
Subscription pricing is determined by: NOTE 17—Appropriate test specimens are strips approximately 25 to 50 mm wide, to mm long and 3 to 6 mm thick. Test Method B can be used only for coating requirements that have a numerical limit, such as coating thickness. NOTE 5—Heat treatment of the base asym may effect its metallurgical properties.