ASTM B322 PDF

0 Comments

ASTM B – Designation: B – 99 (Reapproved ) Endorsed by American Electroplaters’ Socie. Find the most up-to-date version of ASTM B at Engineering International Auto and Engineering Works (IAEW), a year-old company based in Mumbai, follows the (The American Society for Testing and Materials) ASTM.

Author: Dotaur Nikogor
Country: Georgia
Language: English (Spanish)
Genre: Health and Food
Published (Last): 26 November 2015
Pages: 337
PDF File Size: 18.83 Mb
ePub File Size: 20.16 Mb
ISBN: 924-9-46900-282-4
Downloads: 68512
Price: Free* [*Free Regsitration Required]
Uploader: Dam

Methods of removal of heat-treat or mill scale are not included in these methods, because they are covered in practices referring to speci? Petroleum and aromatic solvents of low? Historical Version s – view previous versions of standard.

BGM Fastener Grade 8 Product Specifications

The degree of cleanliness required for metals to be electroplated is greater than for most other finishes. Soil, type of water, available time, rinsing facilities, type of metal, heating, and agitation available, facilities for disposal of cleaner, and type of personnel and equipment all in?

In-process cleaning or even a hot-water? For cold-solvent operations, adequate ventilation must be provided in the work area. Lead alloys are rapidly attacked and nickel and silver surfaces become passivated, requiring special activating treatments for subsequent electrodeposits. These stages are discussed in three parts: Part II—Intermediate alkaline cleaning. Therefore, other materials must be incorporated with the sodium hydroxide.

B — 99 Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Current edition approved Oct. Formulations of Alkaline Cleaners 8 Sometimes this can be traced back to vapor degreasing which removes the oil but not the solid particles. Spray rinsing is very effective, especially if coupled with soak rinsing by having a spray of clean water hit the work as it exits from the rinse tank.

  CRYSTAL OSCILLATOR CIRCUITS KRIEGER MATTHYS PDF

ASTM-B | Standard Guide for Cleaning Metals Prior to Electroplating | Document Center, Inc.

Part III —Final electrocleaning, to remove trace solids and especially adherent impurities. To prevent deposition of loose metallic smuts, the work should be removed from the electrocleaner during the deanodic portion of a cycle. For the adtm reason, it is sometimes necessary to operate at lower pressures even though higher pressures give better cleaning.

Bb322 of materials that come under such regulations are: Part I —Precleaning use of a solvent, emulsion, or alkaline spray to remove the bulk of the soil.

Attention should be given to proper 2 procurement since, even in the same category, not all cleaners are equally effective. The effective life of a cleaning bath must be estimated and baths discarded when exhausted.

This is followed by immersion in cold solvent to cool the parts. Asfm is also useful in reducing the viscosity of waxes and heavy oils, to enable later cleaning stages to be more effective, or to surround? These stages are discussed in three parts: Rinse tanks should have adequate over? A discussion of equipment is asgm the scope of this practice 2, 3. Because of the speci?

Sometimes a change in soils may require a change in cleaners or a change in the method of cleaning. With some cleaners, adequate rinsing is difficult to obtain after the cleaner has dried on the work.

Usually, even with light soils, it is advisable to retain multistage cleaning, thereby increasing the life and efficiency of the astk solutions. Additives for lubricating and sulfurized cutting oils are chosen for their ability to adhebe tenaciously and are difficult to remove. Agitation is very good in spray cleaning if the sprays hit the solid surfaces directly.

  ECUACIONES DIFERENCIALES HOMOGENEAS EJERCICIOS RESUELTOS PDF

Alkaline chelated v322 and cleaning solutions, alone or with sodium cyanide, used as a soak or electrocleaner, are often preferred before electroplating on ferrous alloys. It is not meant to apply to every speci? Cathodic cleaning should seldom be used as a? Too high a pH will result in lowering of the bacteria action, and oil will be built-up.

Norma ASTM B()

Cathodic electrocleaning solutions are more sensitive to chromic acid contamination than anodic electrocleaning solutions. Various metals are electroplated for decorative or engineering finishes. Oxygen gas is evolved on the surface. The cleaners usually contain surface-active, soap-like materials which foam if agitated vigorously. The cleaner should be buffered to have a high tolerance for acidic soils.

Drying 3b22 the cleaner on the work before rinsing should be avoided by having fog nozzles after cleaning tanks, if necessary, or by decreasing transfer time or operating temperatures.

Sodium hydroxide alone could impart this property, but it lacks the detergent action to remove oils, greases, and solid particle soils.

Electroplated articles are used in many industries such as the marine, automotive, plumbing? Usually, even with light soils, it is b3222 to retain multistage cleaning, thereby increasing the life and efficiency of the cleaning solutions.

Check the age of the cleaner. Good housekeeping is desirable to avoid bacterial contamination of emulsion cleaners. If this is a cause, a high-pressure solvent spray will often help. Part II —Intermediate alkaline cleaning. If pitting is general and on all parts, the trouble is probably in the electroplating tanks.