![]() A higher iron content can be altered by increasing or reducing the rate of air bubbling. It is better to use air agitation, since higher plating rates can be achieved than with cathode rod movement. Solution temperature is typically 130 to 140F. It is important to control the ratio, keeping ferric ions below 20 pct. Total iron includes ferrous and ferric ions. Addition agents include stabilizers for the ferrous iron, organic brighteners, leveling agents and wetting agents. Preferred solutions for plating bright nickel-ironĪre slightly more dilute than nickel plating solutions in order to obtain a high iron alloy without using a high iron concentration in the solution. The higher the iron content, the lower its corrosion resistance. At equal thickness, nickel-iron plating is less resistant to corrosion than nickel. The addition agent system is also more complex, so electrolyte control is more difficult. The organic addition agents are more expensive than those for bright nickel, negating the savings on metal. Ductility is usually higher for the alloy coatings than for bright nickel, which may be advantageous if the plated parts are subject to deformation.ĭisadvantages. ![]() This feature is particularly relevant during plating onto tubular steel parts. An additional advantage is that iron entering the plating solution through chemical dissolution of steel substrates, which is highly detrimental in straight nickel plating solutions, is readily dissolved and subsequently plated out. The main advantage is the cost savings, because up to 35 pct of the nickel is replaced with iron. Coatings of nickel-tungsten show high resistance to corrosion, but they are believed not to be true alloys and have not been used in practice.īright nickel-iron plating was strongly promoted as a substitute forīright nickel plating from 1970 to the early 1980s, when the relative price ofĪdvantages. Additionally, nickel-manganese alloys have improved resistance to sulfur embrittlement when heated. Cobalt and manganese are used to increase the hardness and strength of nickel plating. However, they were also developed for special magnetic purposes. Iron is an inexpensive metal and solutions for plating nickel-iron alloys were developed mainly to reduce costs. Nickel alloys electroplated for engineering applications include nickel-iron, nickel-cobalt, nickel-manganese and zinc- nickel. ![]() This article covers nickel-iron and nickel-cobalt applications. Nickel-iron, nickel-cobalt, nickel-manganese and zinc-nickel are electroplated for engineering applications. Products Finishing, November 96, "Nickel Alloy Plating"
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