ASTM B558-79 pdf free

04-15-2021 comment

ASTM B558-79 pdf free.Standard Practice for Preparation of Nickel Alloys for Electroplating.
This practice is intended to serve as a guide forproducing adherent electrodeposits of nickel on nickel alloys.Only those methods that are well known and generally prac-ticed are included. Methods that have been used successfullybut not on a broad scale are not included. Once nickel isapplied,other metals may be electroplated on the product.i1.2 This standard does not purport to address all of thesafety concerns.if any,associated with its use. lt is theresponsibiliry of the user of this standard to establish appro-priate safety and health practices and determine the applica-biliry of regulatory limitations prior to use.The following cleaning treatments may be used. Thechoice of the procedure will be governed largely by thecondition of the surface.
Degreasing is used to remove the bulk of grease, oil,and finishing compounds that may be present on the surface.The cleaning may be vapor degreasing, solvent wash, emulsioncleaning, or soak cleaning.Removal of finaltraces of dirt,grease,and oil is accomplished best withelectrolytic alkaline cleaning. The solution may be either aproprietary cleaner or a formulated one.The procedure used for activating the nickel alloysurface usually determines the soundness of the adhesion. Thechoice of treatment is governed by the condition of the surfaceand the type of alloy. A mild etching treatment should be usedon polished surfaces if a highly finished surface is required.Too mild a treatment may result in a sacrifice of maximumadhesion.
This procedure usesan anodic treatment followed by a cathodic treatment in alow-pH nickel chloride solution. The composition of thesolution is 240 g/L of nickel chloride (NiCl,·6H,O) and 31 mLof concentrated 31.45 mass % hydrochloric acid (density 1.16g/mL). The normal procedure is to make the alloy anodic for 2min at 3 A/dm2 and then cathodic for 6 min at the same currentdensity. The temperature of the solution should be in the rangefrom 20 to 25C.Nickel may be used for the electrodes.Separate tanks are recommended for the anodic and cathodicsteps to avoid contamination of solution but a single tank maybe used. Rinsing should be used before electroplating exceptwhere indicated in Table X1.1.ASTM B558 pdf download.

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