ASTM B507-14 (R2021) pdf freee download.Standard Practice for Design of Articles to Be Electroplated on Racks.
1 .1 This practice covers design information for parts to be electroplated on racks. The recommendations contained herein are not mandatory, hut are intended to give guidance toward good practice.
1 .2 The values stated in SI units are to he regarded as standard. No other units of measurement are included in this standard.
1 .3 This standard does not purport to ac/dress all of the safrrv concerns, if any, associated with its use. it is the responsibility of thee user of this standard to establish appropriate safer health, and environmental practices and determine thee applicability of regulatory limitations prior to use.
2. Significance and Use
2.1 When an article is to be electroplated, it is necessary to consider not only the characteristics of the electroplating process, hut also the design of the part to minimize electroplating and finishing costs and solution dragout as well as to improve appearance and functionality. It is often possible during the design and engineering stages to make small adjustments in shape that will result in considerable benefit toward a better quality part at a lower cost.
2.2 The specific property of an electroplating process that would require some attention to the details of optional designs, is the throwing power of the electroplating solution. This term describes the properties of the solution as it relates to the solution electrical resistance and solution capacitance at the cathode and overall efficiency of the electrolyte system. Throwing power is defined as the improvement of the coating distribution over the primary current distribution on an electrode (usually cathode) in a given solution, under specified conditions.
3. Current Distribution and rrhring Power
3. 1 The apparent current during practical electroplating is never uniform over the surface of the product. Even parallel plates have a nonuniform distribution of current when freely suspended in a bath as shown in Fig. 1. In this example. the current lines tend to concentrate as corners, and edges (high- current density) of the part. Consequently more metal is deposited at the high-current density areas than at the lowcurrent density areas.ASTM B507-14 pdf download.