GM 9984120 Electrodeposition Primer for Small Parts Cathodic ELPO Test Standard

Automotive Tests

GM 9984120 Electrodeposition Primer for Small Parts Cathodic ELPO Test Standard

This specification covers pretreatment, paint materials, and some processing requirements for waterborne, black, cathodic electrodeposition primers (ELPO or e-coat) that are typically used on small parts. Paint durability requirements are also included. The outer metal referred to in this specification must meet the provisions outlined in section 1.2, Typical Applications. These requirements apply to ELPO coating applications that require low, medium and high film thickness.

GM 9984120 Electrodeposition Primer for Small Parts Cathodic ELPO Test Standard

This specification aims to ensure that the ELPO materials used in parts supplied to General Motors are of high quality and environmentally acceptable. Materials containing lead or hexavalent chromium are no longer accepted in parts referred to in this specification.

This specification covers parts coated with ELPO outside of GM Assembly Facilities, including parts that may receive a refinishing coat. These requirements are primarily designed for parts that are not considered exterior metal. However, in some cases, replacement body metal. However, in some cases, the replacement body metal may refer to this standard. When this occurs, the outer body panels should be covered using ELPO materials equivalent to this standard. When this occurs, the outer body panels must be covered using ELPO materials equivalent to OEM body products. These ELPOs will be identified in the Comments section of materials approved and listed in MATSPC.

Pretreatment Needs

Parts should be cleaned and phosphate pretreated using approved materials as shown in the GM Corporate Materails File for spraying or dipping operations. Only phosphate materials approved by GM Engineering Standard 9984123 (zinc phosphate) or 9984006 (iron phosphate) may be used. All requirements of 9984123 or 9984006 must be met. Processing parameters should conform to those recommended by chemical suppliers. Deionized (DI) or reverse osmosis (RO) water rinses must be included and properly maintained to meet the processing performance requirements of this specification. Alternative processes must receive engineering approval.

Repair Requirements

Cooked ELPO will present a smooth, even surface. Bubbles, rips, rinse residue, etc. unacceptable. Defects in the ELPO coating that require repair should be damp sanded with P400 sandpaper. In case of transition to bare metal or other signs of incomplete coating, the repair area should be sanded and then reworked through the phosphate and ELPO system. If there is a defect after repair, the part should be stripped completely to bare metal (if any) or scrapped. Any other repair procedure must obtain Engineering approval prior to use.

Craters are undesirable or indicate contamination of the ELPO application and curing process. When craters are evident, efforts should be made to identify the source and reduce contamination.

As Eurolab laboratory, we provide the best service to you, our manufacturers, with our experienced and professional staff within the scope of all automotive standards. Our laboratory and test team work diligently to provide the best service for manufacturers.

Get Offer Now

To get an appointment, to get more detailed information or to request an evaluation, you can ask us to fill in our form and reach you.

Whatsapp