Description / Abstract:
This specification covers the basic requirements for nickel
chromium plating on stainless steel. The properly applied finish
provides excellent adhesion and corrosion protection. Nickel-chrome
plating on other metals is covered by GMW14672.
Material Description. Not applicable.
Symbols. Not applicable.
Applicability.
Code A: Primarily applicable to exterior
fasteners, moldings and other trims made of austenitic stainless
steel (300 series per SAE J405 or regional equivalent). The
stainless substrates may not need buffing and provide excellent
color match for surrounding plated trim. Coating consists of four
(4) layers; a woods nickel strike (necessary for proper adhesion of
plating to stainless), bright-nickel, microporous nickel, and
chromium.
Code B: Primarily applicable to austenitic
stainless steel (300 series) screws and bolts and to stainless
steel components for interior use only. Coating consists of three
(3) layers including woods nickel strike, bright nickel, and
chromium.
Code C and Code D: Primarily applicable for a
specific corrosion resistance requirement and color match, and may
be used for exterior (Code C) or interior (Code D)
applications.
Code E: Primarily applicable to coatings whose
purpose is to color match other parts. Chromium thickness,
therefore, is not specified. Code E may be used for interior trim
applications.
Code F: Primarily applicable to exterior and
interior moldings and other trims made of Ferritic Stainless Steel
(Types 434 – Unified Numbering System (UNS) S43400 and 436 - UNS
S43600). The stainless steel substrates may not need buffing and
provide excellent color match for surrounding plated trim. Coating
consists of four (4) layers which include a woods nickel strike,
bright nickel, microporous nickel, and chromium.
Remarks. Type 434 and Type 436 stainless steel,
as well as those used with Code C, Code D, and Code E (chrome
flash), normally require mechanical finishing (pre-buff strip, part
buffing) to meet component appearance requirements. The mechanical
finishing requirements shall be agreed upon between stainless steel
supplier and user.