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The clock is ticking for paint and coating operations to reduce HAP emissions and meet EPA guidelines.
Most finishing consultants have lost count of the number of times that inadequate cleaning and pretreatment was the cause of defective painting or plating. Skip plating, blistering, delamination—these are just some of the commonly found defects caused by poor cleaning.
This article is a re-publication of the 17th William Blum Lecture, presented at the 63rd AES Annual Convention in Denver, Colorado, on June 28, 1976.
Technological advances in electronics manufacturing and the design of automobiles have brought about a trend toward very narrow specifications and increasingly stringent requirements on the quality of electrodeposited layers of nickel.
A novel hexavalent chromate-free conversion coating was developed to improve anti-corrosion and adhesive-bonding characteristics of the magnesium alloys and zinc-nickel (Zn-Ni) plated steel substrates. The corrosion behavior of the coated and uncoated alloys was investigated by neutral salt fog (NSF) and electrochemical corrosion tests. Surface wettability of the pretreated substrates was investigated by static contact angle measurements. Wet-tape adhesion tests verified that there is strong adhesion between the primer and the chem film-treated substrates. The morphology and composition of the coated surfaces were investigated by optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDX) methods. This trivalent chromium-based surface treatment is a potential hexavalent chromate conversion coating replacement for magnesium alloys and Zn-Ni plated steel.
The growth of electroless plating is traceable to many factors, but three key drivers over the years helped spur growth of the technology.
Areway Acquisition finishes forged and cast aluminum wheels for many of the cars and trucks that you see on the road today.
In the search for the “next best thing,” some platers are turning to an electroless nickel bath with boron, often with remarkable success and outstanding results. Thus, the reintroduction of NiB as a cost-effective Chrome replacement.
This paper discusses recent research work on the development of a functional trivalent chromium plating process from a trivalent-based electrolyte to replace hexavalent chromium plating. Hexavalent chromium plating has been used for many years to provide hard, durable coatings with excellent wear and corrosion resistance properties. However, hexavalent chromium baths have come under increasing scrutiny due to the toxic nature of the bath, effects on the environment and workers’ health. In this paper are results from our development program aimed at achieving properties comparable to existing hexavalent chromium plating for functional applications. Specifically, recent efforts in plating chromium on the internal surfaces of cylindrical parts will be presented, as well as wear test data.
