Guide to Distinguishing between Genuine and Fake Alloy Resistors: Shunhai Technology Teaches You to Identify Coating Traps
Date：2025-12-17
Viewed：8
Alloy resistors are key components in the electronic components market, and their quality directly affects circuit performance. However, some unscrupulous merchants often pass off inferior products as good in pursuit of profit, and coating problems are a common means of fraud. As a senior enterprise in the industry, Shenzhen Shunhai Technology Co., Ltd., with years of experience, reveals how to identify the plating traps of alloy resistors.
The importance of coating on alloy resistance
The coating of alloy resistors not only protects the internal alloy materials, but also affects the electrical performance, welding reliability, and corrosion resistance of the resistors. High quality coatings can ensure long-term stable operation of resistors in complex environments, while inferior coatings may cause a series of problems such as resistance drift, poor welding, and even resistor damage.
1、 Identification of Coating Materials
（1） Appearance color judgment
Authentic features: The coating of genuine alloy resistors usually has a uniform and bright color. For example, the nickel plating layer presents a silver white slightly yellowish luster, with a smooth surface and no obvious defects; The gold-plated layer has a bright golden appearance and a full color. Taking the high-quality alloy resistors represented by Shunhai Technology as an example, their nickel plating layer reflects uniformly under normal light without dark spots or color differences.
Characteristics of counterfeit products: The coating color of counterfeit products is often uneven, and there may be local dullness, graying, or obvious color differences. The nickel plating layer may be too pale and lack the expected metallic texture; The gold plating layer may have a color that is too light or too dark, resulting in significant differences from the genuine product.
（2） Hardness testing assistance
Authentic performance: The coating is lightly scratched with a hardness testing pen, and the hardness of the genuine alloy resistor coating is moderate. Generally speaking, nickel plating has a high hardness and can resist a certain degree of scratches, and the coating material will not easily fall off at the scratch site.
Fake flaws: The hardness of inferior coatings may be too low, and a gentle scratch may result in deep and rough scratches, and even the phenomenon of coating peeling off. This is because counterfeit products often use low-quality coating materials to reduce costs, and their hardness and adhesion cannot meet the standards of genuine products.
2、 Evaluation of Coating Thickness
（1） Microscopic observation
Authentic standard: Observing through a metallographic microscope, the coating thickness of genuine alloy resistors is uniform and meets industry standards. For example, the thickness of the nickel plating layer is usually between 5-15 μ m, and the specific thickness varies depending on the application scenario and specifications of the resistor. The alloy resistors provided by Shunhai Technology have a uniform and consistent coating that can be clearly seen under a microscope, with thickness errors controlled within a very small range.
Fake product vulnerability: The coating thickness of counterfeit products may vary greatly, with some areas being too thick, some areas being too thin, and even some areas having no coating. This is due to improper process control or deliberate cutting corners during the electroplating process by unscrupulous merchants.
（2） Magnetic testing reference
Authentic characteristics: For magnetic coatings such as nickel plating, high-precision magnetic thickness gauges are used for testing. The thickness measurement of the coating of genuine resistors should be within the specified range, and the measurement values of different parts should have small fluctuations. Because legitimate manufacturers can precisely control the thickness of the coating during the electroplating process, ensuring product consistency.
Abnormal counterfeit goods: The magnetic thickness gauge of counterfeit goods may have significant fluctuations in measurement results, even far from the nominal thickness. This is because the uneven thickness of its coating leads to unstable magnetic detection results, exposing its counterfeit nature.
3、 Inspection of Coating Adhesion
（1） Tape adhesion test
Authentic result: Use 3M standard tape to firmly adhere to the surface of the alloy resistor coating, and then quickly pull it up. The coating of genuine resistors should be firmly attached, and after removing the tape, there should be no peeling or flaking on the surface of the coating. This indicates that the adhesion between the coating and the substrate is good and can withstand various external forces in practical use.
Counterfeit phenomenon: After tape adhesion testing, the coating of counterfeit products may be partially or completely peeled off by the tape, resulting in coating detachment. This indicates that the adhesion of the coating is insufficient, and during welding or vibration processes, there is a risk of separation between the coating and the substrate, which affects the resistance performance.
（2） Thermal shock test simulation
Authentic performance: The alloy resistor is subjected to thermal shock testing, which involves quickly switching between high temperature (such as 150 ℃) and low temperature (such as -55 ℃) environments. After multiple cycles, the coating of the genuine resistor can still remain intact without cracks, bubbles, or peeling. This is because high-quality coating materials and good processes can make the coating adapt to the thermal stress caused by temperature changes.
Flaws in counterfeit products: After thermal shock testing, the coating of counterfeit products may show obvious cracks, bubbles, or even detachment. This is due to the poor quality of the coating, which cannot withstand the stress caused by temperature changes, thus exposing its quality defects.
Professional support from Shunhai Technology
Shenzhen Shunhai Technology Co., Ltd., as a professional enterprise in the field of alloy resistors, not only provides genuine and guaranteed alloy resistor products, but also has a complete testing system to strictly control the coating quality of each alloy resistor from incoming inspection to outgoing inspection. The company has professional testing equipment and an experienced technical team, which can accurately identify various coating traps and provide customers with reliable products. At the same time, Shunhai Technology also provides professional technical support and after-sales service to customers, helping them solve various problems encountered during the use of alloy resistors.
summary
To identify the plating traps of alloy resistors, multiple methods such as visual observation, hardness testing, thickness evaluation, and adhesion testing need to be comprehensively used. With the continuous advancement of technology, the means of counterfeiting counterfeit and inferior products may become increasingly complex. However, as long as scientific identification methods are mastered, combined with the guidance and guarantee of professional enterprises, it is possible to effectively avoid purchasing inferior products. In the future, the electronic components market will become more standardized. We look forward to the joint efforts of all parties in the industry to create a fair and honest market environment, so that high-quality alloy resistor products can provide solid support for the development of the electronic industry.
